Question

Plz help What happens to chromosomes during crossing-over?

1. Sister chromatids are pulled apart by spindle fibers.
2. Sister chromatids separate at the centromere.
3. Homologous chromosomes exchange corresponding segments of DNA.
4. Homologous chromosomes move from one side of the cell to the other.

Answer 1

How does crossing over affect the alleles of a chromosome?

Since the chromosomes are homologous, breaks at corresponding points mean that the segments that are broken off contain corresponding genes, i.e., alleles. ... Crossing over results in recombination of genes found on the same chromosome, called linked genes, that would otherwise always be transmitted together.