Edexcel International GCSE Science (Double Award), topic 3
Reproduction and inheritance
This topic is about how organisms reproduce and how characteristics are passed from parents to offspring. It covers sexual and asexual reproduction in flowering plants and humans, then genes and the genome, patterns of inheritance, and how mitosis, meiosis and random fertilisation lead to genetic variation.
Revision notes
Worksheet
FlashcardsSubtopics
Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each. Biology-only subtopics are left out.
- 1Sexual and asexual reproduction, and reproduction in plants Spec 3.1–3.7Sexual and asexual reproduction, flower structure, pollination, fertilisation, seeds, germination and asexual reproduction in plants.NotesQuestions 8Flashcards 14
- 2Human reproduction Spec 3.8–3.13The male and female reproductive systems, oestrogen and progesterone in the menstrual cycle, the placenta, amniotic fluid and puberty.NotesQuestions 6Flashcards 12
- 3DNA, genes and protein synthesis Spec 3.14–3.18BThe genome, genes and chromosomes: where DNA is found in a cell, and how each gene codes for a particular protein.NotesQuestions 3Flashcards 3
- 4Inheritance Spec 3.19–3.27Alleles and genetic terms, polygenic inheritance, monohybrid crosses and genetic diagrams, family pedigrees, probability and sex determination.NotesQuestions 6Flashcards 11
- 5Cell division, variation and evolution Spec 3.28–3.39Mitosis and meiosis, genetic and environmental variation, mutation, natural selection and antibiotic resistance.NotesQuestions 6Flashcards 12
Whole topic
When you have done the subtopics: test yourself on everything, or print the lot.