Biology: Genetics & Evolution
Topic overview
Mendelian genetics, genotype and phenotype, natural selection, variation and speciation (official B4/B7)
Key concepts
The five modules are verified separately. Math 1 contains no calculus; Math 2 does not require complex numbers, matrices or general differential equations. Each combination reuses module questions and shares them with the special-topic practice; it is for scope-restricted training only and does not represent unseen questions, complete coverage or official difficulty. Please choose modules according to the course you are applying for.
Key points
- ◆Follow the prerequisite knowledge requirements given by the examination body; new concepts may only be used when the question provides sufficient guidance.
- ◆The examples on this site are training with a limited scope and do not represent full syllabus coverage or official difficulty.
Worked examples
Try each example yourself before checking the explanation.
A cross between two heterozygotes (Bb × Bb) gives an expected phenotype ratio of:
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