BIO205H5 Chapter Notes - Chapter 7: Mutation, Gamete, Sympatric Speciation
Document Summary
By studying how evolution occurs in wild populations, we have seen that natural selection can later a population"s traits in a relatively short time. The process of evolution depends on genetic variation: when genetic variation is present, it allows evolution by natural selection. Macroevolution: operates at the species level and higher levels of taxonomic organization. Polygenic: when a single trait is affected by several genes. Pleiotropy: when a single gene affects multiple traits. Epistasis: when the expression of one gene is controlled by another gene. Random assortment: the process of making haploid gametes in which the combination of alleles that are placed into a given gamete could be any combination of those possessed by the diploid parent. Mutation: a random change in the sequence of nucleotides in regions of dna that either comprise a gene or control the expression.
