01:119:115 Lecture Notes - Lecture 46: Human Reproductive System, Sequential Hermaphroditism, Internal Fertilization
15 Feb 2018
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Document Summary
Concept 46. 1 both asexual and sexual reproduction occur in the animal kingdom: asexual reproduction involves the formation of individuals whose genes come from a single parent, there is no fusion of sperm and egg. Diverse mechanisms of asexual reproduction enable animals to produce identical offspring rapidly: many invertebrates can reproduce asexually by fission, in which a parent separates into two or more approximately equal-sized individuals, budding is also common among invertebrates. This is a form of asexual reproduction in which new individuals split off from existing ones. It allows isolated animals to reproduce without needing to find a mate. It can create numerous offspring in a short period of time. In stable environments, it allows for the perpetuation of successful genotypes. Fifteen species of whiptail lizards reproduce exclusively by parthenogenesis: there are no males in this species, but the lizards imitate courtship and mating behavior typical of sexual species of the same genus.
