CAIE A Level Biology 9700 · Inheritance
A plant cell is heterozygous for three genes: T and t (tall/short stems) and L and l (large/small leaves) are linked on the same chromosome pair. F and f (fragrant/non-fragrant flowers) are on a different chromosome pair.
Explain how the behaviour of chromosomes during meiosis in this cell produces genetically different gametes, and how random fertilisation contributes to genetic variation in offspring.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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