What happens physically during the process of crossing over? Two homologous chro

Question

What happens physically during the process of crossing over? Two homologous chromatids break and rejoin at random sites along the chromosome The genetic information on one chromatid is replaced by copying genetic information from a homologous chromatid without there being any physical exchange between the chromosomes. Two homologous chromatids break and rejoin at precisely the same site along the chromosome so that there is no loss or gain of material on either product. It is not known what occurs during crossing over.

Explanation / Answer

1. What happens physically during the process of crossing over?

B. The genetic information on one chromatid is replaced by copying genetic information from a homologous chromatid without their being any physical exchange between the chromosomes.

This physical change occurs because the two chromosomes segment cross over each other and which results in exchange of genetic information. This helps to increase genetic variation which ensure that the new genes are exposed to the environment.

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