1.) (Sorry if incorrect I am not sure if you mean one thing or something different.) a.For sexual reproduction you need meiosis to reproduce those haplpid sex cells or else you would be born a clone of your parent. OR b. For sexual reproduction you need crossing over basically when two different chromosomes cross over during prophase one. This helps create genetic variation to not be a clone of your parents.
2.)It increases genetic variation by crossing over.
-Sorry if I was incorrect had to jog my memory a little for this stuff!
