BIOL-4700 Chapter Notes - Chapter 5: Sexual Selection, Disruptive Selection
20 Mar 2017
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Chapter 5: sexual selection is selection for traits that increase mating success, descent of man and selection in relation to sex (1871) Two distinct forms of sexual selection (one favors males to be attractive to female, the other where male traits are in competition with others) To reproduce and pass off their genes to a new generation. Sexual reproducing individuals reproduce their genetic material in half when it is passed down. With asexual reproduction, all of your genes are passed down so there is no variation. Cost of asexual reproduction: off spring are identical to parent. Disruptive selection choosing the two extremes rather than the intermediates. Females cannot increase their number of offspring produced by mating with more than one male (like males) Exception: mating with male who has limited sperm or is incapable of fertilizing her eggs. The more males that females mate with, the shorter they live. The sperm of male drosophila have terrible chemicals.
