BIOL 123 Lecture Notes - Lecture 21: Semelparity And Iteroparity, Emperor Penguin, Internal Fertilization
Document Summary
19. 1 most sexual animals have two types of gamete: sperm and eggs. 19. 2 unbiased sex ratios are normally favored by natural selection. More male genes in the next generations, making them more into. 19. 3 the hymenopteran sex ration system is often used to bias sex ratios when mating is equilibrium incestuous. 19. 4 separate sexes evolve when it is hard to combine male and female sexual functions. Hermaphrodite has to have a high ability for female and male functions. If not high, the ability to reproduce would be less than a normal sexual reproduction. Hermaphrodites are able to mate with any member of the species regardless of gender. Evolutionary problem however with hermaphrodites with males and females. Hermaphrodites cannot evolve in sexual populations if the total. A + b < 1 production of gametes of the hermaphrodites is small. A = b, a + b 1, so a = b = .
