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Brainlag Learn / GCSE Biology

Inheritance, variation and evolution

Meiosis and DNA, Punnett squares and family trees, inherited disorders and embryo screening, natural selection, selective breeding, genetic engineering and cloning, and classification.

Lessons

  1. Reproduction, meiosis and DNASexual and asexual reproduction, how meiosis halves the chromosome number, and how DNA, genes and the genome fit together. 20 min, free
  2. Genetic crosses, family trees and sexAlleles, genotypes and phenotypes, Punnett squares with probabilities, ratios and percentages, family trees and how sex is inherited. 25 min, free
  3. Inherited disorders and embryo screeningPolydactyly and cystic fibrosis, carriers, chances for a couple's children, and the arguments for and against screening embryos. 20 min, Plus
  4. Variation and evolutionGenetic and environmental variation, mutations, natural selection, antibiotic resistance, fossils, extinction and how new species form. 25 min, Plus
  5. Selective breeding, genetic engineering and cloningHow people change organisms on purpose: selective breeding, genetic engineering, and cloning plants and animals (Biology only), with benefits and risks. 20 min, Plus
  6. Classification and evolutionary treesThe Linnaean ranks, binomial names, the three-domain system and reading evolutionary trees. 20 min, Plus

Practise and test

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