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Edexcel GCSE Combined Science Topic 3 Genetics – Learn Guide

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1.1 Sexual reproduction and gametes

1.3 Practice: Meiosis and gametes

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2.1 Genome, genes and DNA structure

2.2 Extracting DNA from fruit

2.3 Practice: DNA and the genome

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3.2 Genotype and phenotype

3.3 Practice: Genes and alleles

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4.1 Genetic diagrams and Punnett squares

4.2 Probability, ratios and percentages

4.3 Practice: Monohybrid crosses

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5.1 Family pedigrees

5.2 Sex determination

5.3 Practice: Family pedigrees and sex determination

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6.1 Causes of variation

6.3 Practice: Variation and mutation

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7.1 Reading the human genome

7.2 Medical uses and issues

7.3 Practice: The Human Genome Project

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8.1 Mixed retrieval

8.2 Exam practice