Which statement best explains how crossing over increases the genetic diversity of sexually reproducing organisms? a. during crossing over, genetic information is exchanged between two homologous chromosomes. b. during crossing over, an ovum is fertilized by any one out of millions of unique sperm cells. c. during crossing over, homologous chromosomes are randomly segregated to different daughter cells. d. during crossing over, a mutation of a cell's genetic information occurs as dna is replicated.