Why does crossing over occur more often between two distantly linked genes than between two closely linked genes on the same chromosome?

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22-10-2019
Biology

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Why does crossing over occur more often between two distantly linked genes than between two closely linked genes on the same chromosome?

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Diatonic254 Diatonic254 · Answer 1 · 2019-10-24T09:51:15+02:00

Answer:

This is because crossing over occurs between two homologous chromosomes. It involves an exchange of segments of their arms of the two chromosomes during Metaphase I of meiosis. Genes on the different chromosomes are, therefore, more likely to be crossed over than genes on the same chromosome. In addition, because sections of the arms are exchanged, genes that are close to each other on the same chromosome are more likely to be exchanged together (these are called linked genes) than genes that are far apart on the same chromosome.

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