1 Answer | Add Yours
The crossing over happens because the two alleles that make up the parent chromosomes are so close together, occasionally a gene on one allele can get "stuck" to the other allele, and the genes can switch places. Kinda like squishing two ropes of play-doh together, then trying to pull them apart-sometimes you have some transference of play-doh.
We’ve answered 395,776 questions. We can answer yours, too.Ask a question