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Chapter 20
"Genes Within Populations" Evolutionary Biology, BIO 152 CSU Chico
Question | Answer |
---|---|
inheritance of acquired characteristics | changes that individuals acquired during their lives were passed on to their offspring. |
population genetics | the study of the properties of genes in populations |
the requirements to be in Hardy-Weinberg equilibrium | no mutation, no genes are transferred to or from other sources, mating is random, population size is very large, no selection occurs. |
gene flow | the movement of alleles from one population to another |
assortive mating | phenotypically similar individuals mate |
genetic drift | frequencies of particular alleles may change drastically by chance alone |
founder effect | one or a few individuals disperse and become the founders of a new, isolated population at some distance from their place of origin |
bottleneck effect | populations may be drastically reduced in size, this may result from flooding , drought, epidemic disease, and other natural forces, or from changes in the environment |
fitness | quantify reproductive success |
frequency-dependent selection | the fitness of a phenotype depends on its frequency within the population |
oscillating | selection favors one phenotype at one time and another phenotype at another time |
heterozygote advantage | favors individuals with copies of both alleles and thus works to maintain both alleles in the population |
disruption selection | selection acts to eliminate intermediate types |
directional selection | selection acts to eliminate one extreme from an array of phenotypes, the genes promoting this extreme become less frequent in the population and may eventually disappear |
stabilizing selection | selection acts to eliminate both extremes from an array of phenotypes, increasing the frequency of the already common intermediate type |
assortive mating a. affects genotype frequencies expected under Hardy-Weinberg Equilibrium b. affects allele frequencies expected under Hardy-Weinberg equilibrium c.has no effect on the genotypic frequencies expected under Hardy-Weinberg | a. affects genotype frequencies expected under Hardy-Weinberg Equilibrium |
relative fitness a. refers to the survival rate of one phenotype compared to that of another b.refers to the reproductive success of a phenotype d. none | a. refers to the survival rate of one phenotype compared to that of another |