Biology 1201A Lecture Notes - Lecture 8: Natural Disaster, Gene Flow, Assortative Mating

• School: Western University
• Department: Biology
• Course: Biology 1201A
• Professor: Jennifer Waugh

Document Summary

Normal in malaria area= low fitness: homozy. Rr and ss equal: heterozygote (rs)= b/w 0. 5 and 1. 0, rr and ss b/w 0 and 0. 5, f(r)= f(s)= 0. 5. If there are heterozygotes and homozygotes have the same fitness. If no evolutionary forces at work allele frequencies should stay the same. Change in allele frequencies due to the effect of chance in small samples. Results in fixation in the long term (if no opposing evolutionary forces: not predictable random, no pattern, only predictable outcome is fixation if: It decreases the genetic variation in a population. Doe n(cid:859)t (cid:272)ause (cid:373)utatio(cid:374)s or disease does inc. homozygosity: disassortative mating, dissimilar phenotypes mate like with not like, promotes heterozygosity, ex. Left mouth and right mouth fish like to mate with each other if phenotype is heritable, they have diff. genotypes and alleles: (cid:449)e(cid:859)re go(cid:374)(cid:374)a get a lot of heteroz(cid:455)gotes still not heterozygote advantage because it is not selection.