BSC 385 Lecture Notes - Lecture 4: Aestivation, Directional Selection, Brine Shrimp

• School: University of Alabama
• Department: Biological Sciences
• Course: BSC 385
• Professor: Jonathan Benstead

Document Summary

08/26/2015 (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Migration is most important in preventing populations from diverging. Inbreeding increases the number of homozygotes than predicted by. Data showing a deficit of heterozygotes and an excess of homozygotes may be evidence of inbreeding (cid:1) Inbreeding may lead to reduced mean fitness if it generates offspring homozygous for deleterious alleles (cid:1) (cid:1) (cid:1) (cid:1) Response (r) to selection is determined by the heritability (h2) of the trait and the selection co-efficient (s) (cid:1) (cid:1) (cid:1) (cid:1) There is an environmental component to phenotypes (cid:1) Phenotypic plasticity: individual genotypes can vary in different environments (cid:1) (cid:1) (cid:1) (cid:1) (cid:1) Biology is seldom as simple as it seems. Traditional hypothesis- mutualism: mammals offer protection and birds eat ticks and clean wounds. Oxpeckers eat ticks but spend most time licking wounds, probing ears. & eating dead skin; mammal host tries to shoo birds 1-2x per minute.