Biology 1001A Lecture Notes - Lecture 10: Genetic Drift, Allele Frequency, Endangered Species
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17. 3 the agents of microevolution: a population"s allele frequencies will change over time if one or more of the hardy-weinberg conditions are violated. Inversion: segment of dna breaks and is inserted in the reverse orientation. 17. 4 non-random mating: mates are selected due to a particular phenotype and an underlying genotype, violates the hardy-weinberg equilibrium (condition 5, major types of non-random mating: Inbreeding: genetically related individuals mate with each other. Inbreeding does not cause evolution: allele frequencies do not change over time. Just moves them from heterozygous into both homozygous genotypes. Inbreeding depression: decline in the average fitness of inbred individuals: recessive alleles tend to be harmful. Inbreeding may cause an increase in lethal homozygous recessive genotypes: outbreeding was introduced as a solution to inbreeding depression. 17. 4b sexual selection often exaggerates showy structures in males: sexual selection: favors individuals with specific traits that enhances their ability to mate with individuals of the other sex.
