Master Topic B5 of OCR Gateway Science A GCSE Biology (J247): sexual and asexual reproduction and meiosis, DNA, genes and the genome, monohybrid inheritance and Punnett squares, inherited disorders and family trees, variation and mutation, evolution by natural selection, the evidence for evolution and classification, and selective breeding and genetic engineering. Worked genetic crosses, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
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