Biology 1001A Lecture Notes - Lecture 16: Meiosis, Outlast, Polyembryony
1 May 2013
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Document Summary
Offspring distinct from either parent and (usually) each other. Armadillos always have 4 offspring at a time that are genetically identical to one another. Poly-embryonic wasps provide a single zygote that fragments into thousands of embryos. Sex does not mean reproduction, it means recombination. Reproduction can occur without sex: in bacteria and other things that reproduce through binary fission. Sex can occur without reproduction: genetic combination without reproduction. Some plants have the option to reproduce sexually or asexually. By vegetative propagation (asexual): creates genetically identical offspring. The amazon molly is obligately asexual: cannot reproduce sexually at all. Sexually reproducing organisms may be dioecious or monoecious. Dioecious: male and female function are housed in different individuals. Every individual is either male or female. Every individual has both male and female functions. Change sex at some point in their lives. Once they reach a relative body size, they change their sex. In males, there is a weak positive success.
