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Question

The diagram given alongside represents a certain phenomenon which occurs during meiosis. Name and explain the phenomenon by using the terms - homologous chromosomes, chromatids, crossing-over. [3 MARKS]


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Solution

Naming: 1 Mark
Explanation: 2 Marks

The phenomenon represented by the diagram is chiasmata formation. During pairing, some chromatids of homologous chromosomes break and rejoin at points of intersection called chiasmata. This causes crossing over with exchange of chromatid material between chromosomes from the parents. This leads to a new combination of genes in the sex cells.

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