Uhmmm... no... in snakes, and birds, the female is the heterozygote and the male is the homozygote, opposite of mammals.
So in snakes, the *female* determines the gender of the offspring.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3754893/
In snakes, females are the heterogametic sex, in that they have two different sex chromosomes, Z and W, while males have two Z chromosomes.
