Question

What happens in crossing over?

#1
Exchange of genes during metaphase of meiosis.

#2
Exchange of genetic material between homologous chromosomes.

#3
Homologous chromosomes fail to separate during mitosis.

#4
Random distribution of chromosomes during mitosis.

Answer 1

#1 These new combinations result from the exchange of DNA between paired chromosomes. Such exchange means that the gametes produced through meiosis exhibit an amazing range of genetic variation.

Step-by-step explanation:

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Answer 2

Exchange of genetic material between homologous chromosomes.

Step-by-step explanation:

Crossing over occurs at prophase I of meiosis. The chromatids break at the junctions and rejoin with the opposite chromatid. This causes exchange of genes between homologous chromosome. It causes mixing of paternal and maternal alleles and is one of the reason that meiotic division causes genetic variation.