applesdontpee, There are many different methods used for sex determination. X/Y is just one. Some animals don't use genes at all. Humans (like many animals) use genes and chemicals (with interesting results when the two don't agree. Hormones tend to win)
applesdontpee, There are many different methods used for sex determination. X/Y is just one. Some animals don't use genes at all. Humans (like many animals) use genes and chemicals (with interesting results when the two don't agree. Hormones tend to win)
Ants use Haplodiploidy
http://en.wikipedia.org/wiki/Haplodiploid