Biology 1201A Lecture Notes - Lecture 19: Genotype Frequency, Gamete, Parthenogenesis
Document Summary
Four turtles were monitored from which they laid eggs in nests on a beach to when their baby turtles reached the ocean and swam away. The data collected is described within the options below. This is copulation resulting in sexual reproduction: coitus results in sexual reproduction, but biologists would not call it sex . Sex is cell fusion, an exchange of genetic material. Haploid egg + haploid sperm = diploid zygote. Most mammals: xx = female, xy = male. Birds, some fish, insects, reptiles: wz = female, Monday, november 20, 2017: zz = male. Snails/slugs, some fish, arthropods: hermaphrodites, ex: earthworms simultaneously male and female, ex: slipper limpets, sequential, starts as male, becomes female when it is bigger, lower in stack becomes female. But have a series of genes that determine mating types. A can mate with alpha but not with another a. Mating type determined by several linked genes. Multiple mating types: in one species, 7 different mating types.
