Traits are transferred to the next generation in the form of genetic material i.e. Biological Molecules 1.1 Biological Molecules: Carbohydrates 1.2 Biological Molecules: Biology. 1. 7.1.3 Predicting Inheritance: Dihybrid Crosses - Save My Exams Summary - Cie a-level biology: genetic technology (a* achieved) 5. WebInheritance: Key Terms Genes & alleles A chromosome is a long DNA molecule which contains genes that code for several different proteins A gene is a length of DNA that WebHeredity is passing characteristics from one generation to the next. Copyright 2015-2023 Save My Exams Ltd. All Rights Reserved. After these experiments, Mendel concluded that the inheritance of two or more traits is not tied to one another. Web16.2.2 Predicting Inheritance: Monohybrid Crosses. Lra has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning. If you find any broken links or .pdf documents or past papers on missing subjects. The genetic information in DNA is in the form of genes. The resulting seed had a heterozygous genotype and were all round and yellow. WebEverything that you need to pass A-level Biology: Revision notes for AQA, CIE, Edexcel A, Edexcel B, Edexcel IAL, OCR, WJEC & Eduqas; Exam Question Booklets; Mindmaps; Every cell has two copies of each gene, and thus two alleles. WebAbout This Site. In this video, I explain ALL of the content required for the "Inheritance" section for AQA A Level Biology. Unit 2.1: Classification and biodiversity - Blended learning. Biology Notes A dominant trait will express itself in both cases i.e. This transfer of traits is seen in all organisms whether they reproduce sexually or asexually. What Web8 9 Genetic inheritance A short video explaining gene inheritance and demonstrating how to use a punnett square Genetic key terms A gamete is a sex cell. A-level Biology focuses on providing students, tutors and teachers with detailed revision materials for A-Level Biology. I got 4 A*s on my A levels thanks to you! It is done through passing on the genetic material or DNA from parents to offsprings. No problem. This means they are expressed in both heterozygous and homozygous individuals, e.g. Known information about the genotypes, Report this resourceto let us know if it violates our terms and conditions. Our customer service team will review your report and will be in touch. WebUnit 2.3: DNA and inheritance - Blended learning. Unit 4: Sexual reproduction in humans - Blended learning. A-Level Biology She has fifteen years of experience teaching the Sciences at KS3 to KS5, and Psychology at A-Level. Designed by the teachers at SAVE MY EXAMS for the AQA A Level Biology syllabus. If you want to see what we offer before purchasing, we have a free membership with sample revision materials. Who was Gregor Mendel? INHERITANCE - AQA A LEVEL BIOLOGY + EXAM QUESTIONS RUN Classification, Biodiversity & Conservation, 18.1.2 The Three Domains: Archaea, Bacteria & Eukarya, 18.2.4 Testing for Distribution & Abundance, 18.3.2 Reasons for Maintaining Biodiversity, 19.1.6 Genetic Engineering: Promoters & Marker Genes, 19.2 Genetic Technology Applied to Medicine, 19.3 Genetically Modified Organisms in Agriculture, 19.3.1 Genetically Modified Organisms in Agriculture, The DNA contained within chromosomes is essential for cell survival, A length of DNA that codes for a single polypeptide or protein is called a, Each gene can exist in two or more different forms called, Different alleles of a gene have slightly, One of the genes for coat colour in horses is Agouti, This gene for coat colour is found on the same position on the same chromosome for all horses. The opposite trait is expressed if one of the alleles is absent. All the seeds obtained as a result of this cross were heterozygous and had a round shape. All Rights Reserved, CIE Lower Secondary Checkpoint Past Papers, IGCSE Sciences (Co-ordinated) (Double) Notes, IGCSE Indonesian Foreign Language (0545) Notes. No allele is dominant or recessive. Such individual have one IA allele and one IB allele. Co-dominance and Incomplete Dominance are examples of such deviations. Copyright 2020 CIEnotes. The round and green as well as wrinkled and yellow were not present in the parent plants. Webwith Olivia Biology Teacher - UK independent school I'm Olivia and I'm a GCSE and A Level Biology Teacher at an independent school in the UK. For example a particular gene that is found only on the X chromosome has two alleles, This occurs on the autosomes (any chromosome that isnt a sex chromosome), These genes are linked and they stay together in the original parental combination. Lra has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning. One allele is maternal in origin while the other one is paternal. A-Level Biology A level Biology Notes - 9700 - CIE Notes He studied seven traits of pea plants; It is important to become familiar with these two terms before studying the laws of inheritance. Biology. Such traits only appear in the case of homozygous genotypes. In this article, we will discuss how different traits are passed onto the next generation in sexually reproducing organisms. Biodiversity, classification and conservation & Genetic engineering: Biodiversity, classification and conservation & Genetic engineering. Signup as a free member below and you'll be brought back to this page to try the sample materials before you buy. IBO was not involved in the production of, and does not endorse, the resources created by Save My Exams. Crossing pink- and white-flowered pea plants produced all pink flowers in the first generation. Genetics, Populations, Evolution & Ecosystems (A Level only), 1.5 Nucleic Acids: Structure & DNA Replication, 2.3 Cell Division in Eukaryotic & Prokaryotic Cells, 2.6 Vaccines, Disease & Monoclonal Antibodies, 4.3 Genetic Diversity: Mutations & Meiosis, 5. For example, if an individual has blood group A, this blood group is his phenotype while the alleles responsible for this blood group are called genotype. St Pauls Place, Norfolk Street, Sheffield, S1 2JE. Based on these experiments, Mendel concluded that each trait is controlled by discrete factors that are separable from one another. Summary - Cie a-level biology: energy and respiration (a* achieved) 2. WebWe study genetics to understand the inheritance pattern and determine the genetic changes. One gene and one allele are on one copy of the chromosome. 16.2 The Roles of Genes in Determining the Phenotype, 1.1.3 Eyepiece Graticules & Stage Micrometers, 1.2 Cells as the Basic Units of Living Organisms, 1.2.1 Eukaryotic Cell Structures & Functions, 2.3.2 The Four Levels of Protein Structure, 2.4.2 The Role of Water in Living Organisms, 3.2.6 Vmax & the Michaelis-Menten Constant, 3.2.8 Enzyme Activity: Immobilised v Free, 4.1.2 Components of Cell Surface Membranes, 4.2.5 Investigating Transport Processes in Plants, 4.2.9 Estimating Water Potential in Plants, 4.2.12 Comparing Osmosis in Plants & Animals, 5.1 Replication & Division of Nuclei & Cells, 6.1 Structure of Nucleic Acids & Replication of DNA, 7.2.1 Water & Mineral Ion Transport in Plants, 8.1.4 Blood Vessels: Structures & Functions, 8.2.1 Red Blood Cells, Haemoglobin & Oxygen, 9.1.5 Structures & Functions of the Gas Exchange System, 10.2.3 Consequences of Antibiotic Resistance, 12.1.3 Energy Values of Respiratory Substrates, 12.2.1 Structure & Function of Mitochondria, 12.2.2 The Four Stages in Aerobic Respiration, 12.2.4 Aerobic Respiration: The Link Reaction, 12.2.5 Aerobic Respiration: The Krebs Cycle, 12.2.6 Aerobic Respiration: Role of NAD & FAD, 12.2.7 Aerobic Respiration: Oxidative Phosphorylation, 12.2.9 Energy Yield: Aerobic & Anaerobic Respiration, 12.2.11 Aerobic Respiration: Effect of Temperature & Substrate Concentration, 13.1 Photosynthesis as an Energy Transfer Process, 13.1.5 Absorption Spectra & Action Spectra, 13.1.6 Chromatography of Chloroplast Pigments, 13.2.1 Limiting Factors of Photosynthesis, 13.2.2 Investigating the Rate of Photosynthesis, 15.1.5 Sequence of Events Resulting in an Action Potential, 15.1.10 Stimulating Contraction in Striated Muscle, 15.1.11 Ultrastructure of Striated Muscle, 15.1.12 Sliding Filament Model of Muscular Contraction, 15.2.1 Electrical Communication in the Venus Flytrap, 15.2.2 The Role of Auxin in Elongation Growth, 15.2.3 The Role of Gibberellin in Germination of Barley, 16.1 Passage of Information from Parents to Offspring, 16.1.5 Meiosis: Sources of Genetic Variation, 16.2.2 Predicting Inheritance: Monohybrid Crosses, 16.2.3 Predicting Inheritance: Dihybrid Crosses, 16.2.4 Predicting Inheritance: Test Crosses, 16.2.5 Predicting Inheritance: Chi-squared Test, 16.2.7 The Role of Gibberellin in Stem Elongation, 16.3.3 Gene Control: Transcription Factors, 17.1.2 Variation: Discontinuous & Continuous, 17.2.2 Natural Selection: Types of Selection, 17.2.3 Natural Selection: Changes in Allele Frequencies, 17.2.4 Natural Selection: Antibiotic Resistance, 17.2.5 Natural Selection: Hardy-Weinberg Principle, 18. Thank you for providing such a helpful website for IGCSE students. A Level Biology Notes - Inheritance | Teaching Resources Genetics | A-Level Biology Revision Notes Thank you CIENOTES!! When writing about genes it is conventional to use a single letter to represent a gene, while different alleles may be indicated by using upper and lower case letters, e.g. What are homozygous and heterozygous alleles? He published his work in 1865, but it was approved by the scientific community in 1906. To ensure quality for our reviews, only customers who have purchased this resource can review it. Biology GCE A level revision guide (2015 specification) - Unit 3. Need a tutor? Tes Global Ltd is The gene for blood type has three alleles: A, a dominant allele produces blood type A, B, a dominant allele produces blood type B, O, two recessive alleles will produce blood type O, In this example a blood type A person is crossed with a blood type B person, Sex-linked genes are located on the sex chromosome, This means the sex of an individual affects which alleles they pass on to their offspring through their gametes, The X chromosome has many more genes on it than the Y chromosome, so sex-linkage that involves the Y chromosome is very rare, Sex linkage is notated using a capital letter to represent the chromosome X or Y and a superscript letter to represent the allele, Haemophilia is a well known sex-linked disease, There are two alleles for factor VIII, the dominant, When a person possesses only the recessive allele, The genetic diagram below shows how two parents with normal factor VIII can have offspring with haemophilia. Chromosomes showing genes, alleles and loci. 16.2.5 Predicting Inheritance: Chi At metaphase of meiosis I, the pairs of homologous chromosomes line up on the equator independently of each other. Chapter 20- Inheritance. A Level Biology OCR Inheritance: Autosomal Linkage | A-level Biology - YouTube 1.2 Cells as the Basic Units of Living Organisms, 5.1 Replication & Division of Nuclei & Cells, 6.1 Structure of Nucleic Acids & Replication of DNA, 13.1 Photosynthesis as an Energy Transfer Process, 16.1 Passage of Information from Parents to Offspring, 16.2 The Roles of Genes in Determining the Phenotype, 19.2 Genetic Technology Applied to Medicine, 19.3 Genetically Modified Organisms in Agriculture. The part of DNA having a gene is called an allele. AQA Module 7 Revision Notes.doc 63.0 KB. They do not show a dominant recessive relationship as predicted by Mendelian laws. The phenotype is the expression of this genetic constitution and its interaction These discrete factors get separated during gamete formation and so that every gamete gets only one of the two discrete factors. Do you want to help students all around the world? Over the last 4 years, Ive helped thousands of students learn biology more effectively, improve their exam technique and achieve top grades. The genes are transferred from parents to the next generation during the process of sexual reproduction. If a trait is expressed even if only one allele is present, it is called a dominant trait. I am very thankful to you for my achievement. 16.2.3 Predicting Inheritance: Dihybrid Crosses. He argues that that the organism selected for studying inheritance should have the following features; He crossed plants through cross-pollination by transferring the pollen the flower from one plant to the other. Mendel crossed a homozygous round seeded plant with a homozygous wrinkled seeded plant. Tes Global Ltd is Humans have 22 pairs of homologous chromosomes. The Control of Gene Expression (A Level only), 8.2 Regulation of Gene Expression (A Level only), Known information about the genotypes, phenotypes and the process of meiosis are used to make, When two individuals sexually reproduce there is an equal chance of either allele from their homologous pair making it into their gametes and subsequently the nucleus of the zygote, Genetic diagrams are often used to present this information in a clear and precise manner so that predictions can be made, These diagrams include a characteristic table called a, The predicted genotypes that genetic diagrams produce are all based on, There is no way to predict which gametes will fuse so sometimes the observed or real-life results can differ from the predictions. It is a condition in which two alleles of a heterozygous genotype express themselves incompletely so that a mixture of two traits is formed. There are two types of linkage in genetics: Women have two copies of the X chromosome (XX) whereas men have one X chromosome and one shorter Y chromosome (XY), Most often sex-linked genes are found on the longer X chromsome, Haemophilia is well known example of a sex-linked disease, Sex-linked genes are represented in the genotype by writing the alleles as superscript next to the sex chromosome. All biology study notes in one page for students. Our customer service team will review your report and will be in touch. WebTypes of Cells Somatic Cells(Body cells)- Cells which are not directly involved in reproduction 46 individual chromosomes per cell. WebAQA A Level Biology Revision Notes Concise resources for the AQA A Level Biology course. Also useful as a revision / homework exercise. Summary A Level Biology Notes - Inheritance - Stuvia 1.1.2 The Importance of Water in Transport, 1.1.3 Mammalian Heart: Structure & Function, 1.1.4 Blood Vessels: Structure & Function, 2.1.1 Properties of Gas Exchange Surfaces, 2.1.5 Practical: Investigating Membrane Structure & Permeability, 2.3.6 Globular Proteins: Structure & Function, 2.3.7 Fibrous Proteins: Structure & Function, 2.3.10 Practical: Investigating the Effect Enzyme and Substrate Concentrations, 3.2.3 Practical: Identifying Mitosis in Plant Cells, 3.3.4 Meiosis: Source of Genetic Variation, 4.1.2 Measuring Biodiversity Within a Habitat, 4.1.3 Comparing Biodiversity Between Habitats, 4.2.3 Importance of Water & Inorganic Ions to Plants, 4.2.4 Starch & Cellulose: Structure & Function, 4.2.6 Practical: Identifying Tissue Types Within Stems, 4.2.7 Practical: Determining the Tensile Strength of Plant Fibres, 5.1.4 Practical: Determining Distribution & Abundance, 5.1.7 Calculating the Efficiency of Biomass & Energy Transfers, 5.3.2 Evidence for the Causes of Climate Change, 5.3.7 Practical: Temperature & Development of Organisms, 5.3.8 Climate Change & the Scientific Community, 5.3.9 Carbon Cycle & Reduction of Atmospheric Carbon Dioxide, 5.4.3 Evidence of Evolution & the Scientific Community, 6.1.2 Micro-organisms: Decomposition & Nutrient Recycling, 6.2.9 Evolutionary Race Between Pathogens & Host, 7.2.6 Practical: Investigating the Rate of Respiration, 7.4.1 Variations in Breathing Rate & Heart Rate, 7.4.2 Practical: Investigating the Effects of Exercise, 7.4.4 Modern Medicine & Participation in Sports, 8.1.3 Nervous System: Response to a Stimulus, 8.2.4 The Role of Animal Models in Research, 8.2.6 Imbalances in Brain Chemicals Leading to Diseases, 8.2.10 Nature vs Nurture in Brain Development, 2.1 Gas Exchange, Cell Membranes & Transport, Different alleles of a gene have slightly, Different alleles arise by the process of, E.g. This law proved that different traits are transferred from parents to the next generation independently of one another. Such traits also exist in organisms that are controlled by more than one gene pair or in other cases, a gene pair can have more than two different alleles. The number of chromosomes is constant in all the individuals belonging to one species i.e. Examples of Incomplete dominance are pink flowers that are produced as a result of a blend of two alleles; one allele for white color and one for the red color. In the next series of experiments, Mendel studied two traits at a time. One pair in humans is different in males and females. Cell Structure. The other allele that is not expressed is called the recessive allele. Copyright 2015-2023 Save My Exams Ltd. All Rights Reserved. The portion of a chromosome that carries a particular gene is called an allele. seed shape and seed color. in the presence of one or both alleles. Although it is seen in all organisms from bacteria to complex mammals, we will mainly focus on the sexually reproducing organisms in this article. He put forward the two universally accepted laws after rigorous experimentation. Thank you CIE Notes for my 2A*s and 2As that I got in the May-June 2018 A-level exams!! Such traits are called recessive traits. When referring to the different alleles be careful about your notation. He crossed two plants having two contrasting traits e.g. When a homozygous plant having white flowers is crossed with another homozygous plant having red flowers, the plants of the next generation have pink flowers, a blend of white and red. Males cannot be carriers, if the faulty allele is on the X chromosome, as they will only have one copy of the gene. These chromosomes are present in the form of pairs. Web9. WebFree high-quality revision notes for CIE-AS Biology 9700, covering all the modules and updated to the latest syllabus specifications. I was expecting worse results but thanks to cienotes I was able to exceed my expectations. While the genes are the same, the alleles may be different, meaning that individuals can be either homozygous or heterozygous at a particular locus. Visually appealing worksheets covering the inheritance topic of A-level Biology. One of the genes for the coat colour of horses has the following two alleles: Predicted ratio of phenotypes in offspring 3 black coat : 1 chestnut coat, Predicted ratio of genotypes in offspring 1 BB : 2 Bb : 1 bb, When working with codominant alleles the genetic diagrams can be constructed in a similar way, however the genotypes are represented using a capital letter for the gene and superscript letters for the alleles (eg. Something went wrong, please try again later. The course encourages creative thinking and problem-solving skills which are transferable to any future career path. 16.2.4 Predicting Inheritance: Test Crosses. If a trait is expressed even if only one allele is present, it is called a dominant trait. Gregor Mendel is the Father of Modern Genetics. He was an Austrian monk who studied heredity in pea plants. Thus, half of the chromosomes come from the mother while the rest come from the father. The two alleles may be the same or different i.e. DNA. Hypothetically there are two different forms (alleles) of that gene found in horses: Each allele can produce a different coat colour: The chromosomes of eukaryotic cells occur in, As there are two copies of a gene present in an individual that means there can be, When the two allele copies are identical in an individual they are said to be, When the two allele copies are different in an individual they are said to be, The genotype of an individual affects their phenotype, Every horse has two copies of the coat colour gene in all of their cells, In contrast a horse that has one black coat allele, Not all alleles affect the phenotype in the same way, This means they are expressed in both heterozygous and homozygous individuals, This means that it is only expressed when present in a homozygous individual, When an individual is heterozygous they will express both alleles in their phenotype, When writing the genotype for codominance the gene is symbolised as the capital letter and the alleles are represented by different superscript letters, for example, A good example of codominance can be seen in human blood types, The gene for blood types is represented in the genotype by, The individual in question is crossed with an individual that is expressing the, The resulting phenotypes of the offspring provide sufficient information to suggest the genotype of the unknown individual, If there are any offspring expressing the recessive phenotype then the unknown individual must have a heterozygous genotype. WebIntroduction Mendelian inheritance Genetics 371B Lecture 1 27 Sept. 1999 The mechanism of inheritance Some early hypotheses: Predetermination e.g., the homunculus theory Blending of traits Introducing a more systematic approach Gregor Mendel (18221884) and his experiments with garden pea But first: Choosing a model organism Inheritance of sexually reproducing organisms was first studied by Gregor Mendel who published his results in 1865. 7.1.2 Predicting Inheritance: Monohybrid Crosses, 1.1.10 Biochemical Tests: Sugars & Starch, 1.1.11 Finding the Concentration of Glucose, 1.3.7 The Molecular Structure of Haemoglobin, 1.3.8 The Molecular Structure of Collagen, 1.4.4 Required Practical: Measuring Enzyme Activity, 1.4.5 Maths Skill: Drawing a Graph for Enzyme Rate Experiments, 1.4.6 Maths Skill: Using a Tangent to Find Initial Rate of Reaction, 1.4.7 Limiting Factors Affecting Enzymes: Temperature, 1.4.8 Limiting Factors Affecting Enzymes: pH, 1.4.10 Limiting Factors Affecting Enzymes: Enzyme Concentration, 1.4.11 Limiting Factors Affecting Enzymes: Substrate Concentration, 1.4.12 Limiting Factors Affecting Enzymes: Inhibitors, 1.4.13 Models & Functions of Enzyme Action, 1.4.14 Practical Skill: Controlling Variables & Calculating Uncertainty, 1.5.2 Nucleotide Structure & the Phosphodiester Bond, 1.5.6 The Origins of Research on the Genetic Code, 1.5.8 The Process of Semi-Conservative Replication, 1.5.9 Calculating the Frequency of Nucleotide Bases, 2.2.2 Microscopy & Drawing Scientific Diagrams, 2.2.6 Cell Fractionation & Ultracentrifugation, 2.2.7 Scientific Research into Cell Organelles, 2.3.7 Uncontrolled Cell Division & Cancer, 2.4.2 Components of Cell Surface Membranes, 2.4.8 Comparing Osmosis in Animal & Plant Cells, 2.4.13 Factors Affecting Membrane Fluidity, 2.5.5 The Role of Antigen-Presenting Cells, 2.6.6 Ethical Issues with Vaccines & Monoclonal Antibodies, 3.1.5 Adaptations of Gas Exchange Surfaces, 3.2.3 Looking at the Gas Exchange under the Microscope, 3.2.11 Correlations & Causal Relationships - The Lungs, 3.4.7 Animal Adaptations For Their Environment, 3.5.8 Interpreting Data on the Cardiovascular System, 3.5.9 Correlations & Causal Relationships - The Heart, 3.5.10 Required Practical: Dissecting Mass Transport Systems, 4.2.6 Nucleic Acid & Amino Acid Sequence Comparison, 4.3.5 Meiosis: Sources of Genetic Variation, 4.3.7 The Outcomes & Processes of Mitosis & Meiosis, 4.4.2 Maths Skill: Using Logarithms When Investigating Bacteria, 4.4.4 Directional & Stabilising Selection, 4.6.7 Quantitative Investigations of Variation, 4.6.9 Genetic Relationships Between Organisms, 5.1.1 Chloroplast Structures & their Functions, 5.1.4 Using the Products of the Light Dependent Reaction, 5.1.7 Investigating the Rate of Photosynthesis, 5.2.9 Investigating the Rate of Respiration, 5.3.8 Calculating Productivity & Efficiency, 5.4.2 Practical Skill: Investigate the Effect of Minerals on Plant Growth, 5.4.3 Microorganisms Role in Recycling Minerals, 6.1.9 Investigating Touch and Temperature Receptors, 6.1.12 Investigating Variables that Affect Heart Rate, 6.2.6 Maths Skill: Calculating Maximum Impulse Frequency, 6.2.8 Transmission Across a Cholinergic Synapse, 6.3.3 Examining Skeletal Muscle Under a Microscope, 6.4.6 Control of Blood Glucose Concentration, 6.4.8 Calculating the Concentration of Glucose in Urine, 7.1.3 Predicting Inheritance: Dihybrid Crosses, 7.1.4 Predicting Inheritance: Test Crosses, 7.3.8 Investigating the Effects of Random Sampling on Allele Frequencies, 7.4.4 Estimating the Size of a Population, 8.2.4 Producing Tissue Cultures of Explants, 8.2.6 Evaluating Data about Genetic Expression, 8.4.3 Investigating the Specificity of Restriction Enzymes, 8.4.9 Genetic Counselling & Personalised Medicine, 7. This includes: genotype + phenotype, concept of These experiments proved that all the traits of an organism come from the combination of traits found in his parents. Biology. If both the alleles for a gene are similar, they are called homozygous alleles. Join over 22,000 learners who have passed their exams thanks to us! A-level Biology A2 Inheritance Summary Worksheets Cambridge International AS and A Level Biology builds on the skills acquired at Cambridge IGCSE (or equivalent) level. Mendel planted these seeds the next year and allowed the new plants to undergo self-pollination. AQA Module 3 Revision Notes.doc 107.0 KB. INHERITANCE Something went wrong, please try again later. This video shows a description of Mendel's work with pea plants to demonstrate dominant and recessive inheritance. I would continue to use this website for my AS revisions this year. AQA Module 2 Revision Notes.doc 87.0 KB. The discrete factors were later called by biologists as genes. A dominant trait will express itself in both cases i.e. If you're ready to pass your A-Level Biology exams, become a member now to get complete access to our entire library of revision materials. Concise resources for the CIE A Level Biology course. Visually appealing worksheets covering the inheritance topic of A-level Biology. seed shape. 7.1.2 Predicting Inheritance: Monohybrid Crosses - Save My Exams 3.7.1 Inherited Change entire unit AQA A2 Biology Subject: Biology Age range: 16+ Resource type: Worksheet/Activity File previews Over 100 slides powerpoint covering all parts of 3.7.1 Inherited Change (and introduction to Hardy Weinberg (3.7.2) as well) complete with handouts and past paper question practice.

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