How might crossing-over benefit an organism? How might it be detrimental?

Question

How might crossing-over benefit an organism? How might it be detrimental?

Answer 1

Crossing over generates new combinations of alleles, an important factor in evolution. These new allele combinations may benefit or hurt the individual who inherits them.

Crossing over during mitosis can sometimes cause diseases such as retinoblastoma (a form of cancer).

Sometimes cells use crossingover for DNA repair.

Answer 2

crossing over enables human variation and uniqueness plus it can, on a certain possibility, hide a recessive trait that is outwardly expressed.

in the same manner, it can bring about a recessive trait that was previously masked.

i hope this answers your question :D