ARCL 140 Lecture Notes - Lecture 8: Speciation, Secondary Sex Characteristic, Phenotypic Trait
4 Feb 2017
School
Department
Course
Professor
Document Summary
Point mutation - transcription and translation errors result in different proteins being created. Adaptive/maladaptive - beneficial to survival, or deleterious. Movement of different phenotypes into a new population. Founder effect - the bottleneck effect - smaller section of population is separated and then future generations have less diversity than the population they originated from. Reduction in genetic diversity - the loss is called the genetic bottleneck. If they are selected out of a population before you reproduce the maladaptive traits will leave the gene pool. The end result is a population with less genotypic diversity but they end up successfully reproducing in their environment. Direct selection - an environment that is directly acting against a particular phenotypic trait, results in a loss of phenotypic diversity. Stabilizing selection - factors that are selecting out these extreme forms of specific phenotype, a larger amount of the population that has the middle phenotype - the extreme portion is being selected out.
