PSYCH 3T03 Lecture Notes - Lecture 12: Fluctuating Asymmetry, Foreign Body, Symmetry In Biology

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3T03
• Professor: Sigai Balshine

Document Summary

Traits that don"t beneit survival can be selected through posiive feedback in a circular fashion. Having the preferences can push the trait to be grander. Having the trait can then push the preference. Something advantageous causes the whole thing to begin and snowball. Populaion of peacocks some have shorter/larger tails (in history, most have short) Some females are choosy for whatever reason, prefer longer tails (some not) No beneit to longer tails in males, don"t need one. Iniial diferences in female preferences and male traits. Choosy female will always mate with longer than average tails. In the next generaion, half the kids born in the scenario will have both the genes for the selected trait (long tail) and the choosy gene (will prefer longer tail) Quarter of progeny will have longer tails, but no choice gene. Quarter of the progeny will have no gene for the ornament and no gene for choice.