They are a very diverse group, and they have remained Humans and sex similar in appearance for 1. In prairie dogs, litter size is positively correlated with the number of male mating partners, possibly owing to the benefits of genetic diversity Humans and sex offspring . Spermatogenesis spermatogonium spermatocyte spermatid sperm Oogenesis oogonium oocyte ootid ovum Germ cell gonocyte gamete. Are prescriptively monogamous societies effectively monogamous? The yellow-bellied marmot and the evolution of polygamy.