BIO SCI 94 Lecture Notes - Lecture 4: Mpra Language, Heterozygote Advantage, Disruptive Selection

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

Sexual selection acts more strongly on males than females. Decrease in fitness due to being subject to increased predation can be more than offset by bing mpre attractive to mates and this having more offspring. Dying young after having a lot of offspring is fine: survival and reproduction. Sexual selection is not a special case of natural selection because the competitions between individuals is for mating opportunities, not survival. Ability of individual to produce viable offspring relative to others of the same species. Directional: changes the average value of the trait. Heterozygous individuals have higher fitness than homozygous individuals do. Certain alleles are favored at different times or in different places. Certain alleles are favored when they are rare but not when they are common. Many of the quantitative traits we observe in nature are normally distributed. Transmission of quantitative traits results from polygenic inheritance: each gene adds a small amount to the value of the phenotype.