Traits are passed down by genes on chromosomes

Where does genetic variation occur in meiosis?

 mean here? Well, a homologous pair consists of one homologue from your dad and one from your mom, and you have 23 pairs of homologous chromosomes all together, counting the X and Y as homologous for this purpose. During meiosis I, the homologous pairs will separate to form two equal groups, but it’s not usually the case that all the paternal—dad—chromosomes will go into one group and all the maternal—mom—chromosomes into the other.

Make a stop motion animation of the process of meiosis (can be physical or digital).  

Learn where variations in DNA come from during reproduction.

Meiosis