Which of the following statements is true of crossing-over?

Crossing-over contributes to genetic diversity or variation. Crossing-over is when homologous* chromosomes exchange genes. ... They have the same genes but can have different versions.

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

hope this : )