BIOL 242 Lecture Notes - Lecture 21: Phenotypic Plasticity, Gene Duplication, Gene Pool

• School: University of San Diego
• Department: Biology Courses
• Course: BIOL 242
• Professor: Paul Bradley

Document Summary

The ability of a single genotype to produce multiple phenotypes. Ex. phenotype of timing and speed of completing metamorphosis. Darwin used a phrase made up of only 3 words to define evolution. Change in allele frequency of a population over time. A localized group of individuals capable of interbreeding and producing fertile offspring. Consists of all the alleles for all loci in a population. Change in nucleotide sequence in the dna. Can result in creation of new alleles. Only those that occur in cells that undergo meiosis (occurring in the germ line) will be passed onto offspring. Hidden recessive deleterious alleles might be beneficial in a new environment. But occasionally do not have severe negative effects. Allow for mutations on duplicated genes to occur that do not affect the original copy of the gene. Ex. increasing number of olfactory receptor genes in vertebrates. Movement of alleles into or out of a population (into or out of a gene pool )