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Definition
| study of genetic variations within populations |
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| localized group of individuals belonging to the same species |
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| a group of populations whose individuals have the potential to interbreed and produce fertile offspring |
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| total aggregate of genes in a population at any one time |
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| a population's allele and genotype frequencies |
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Definition
| frequencies of alleles and genotypes in a population's gene pool remain constant over the generations unless acted on by agents other than recombination |
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| Hardy Weinberg equilibrium |
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Definition
| when a population's allele and genotype frequencies are not changing (equilibrium) |
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Definition
| a change in a population's genetic structure (allele and genotype frequencies) |
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| changes in the gene pool of a small population due to chance |
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| genetic makeup of a small surviving population is unlikely to be representative of the makeup of the original population |
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| genetic drift in a new colony |
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| genetic exchange due to migration of fertile individuals or gametes between populations |
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| change in an organism's DNA |
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| mating between closely related partners |
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| mating where individuals select partners who are like themselves |
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| differential success in reproduction caused by heritable traits |
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| two or more variations of a trait are represented in high enough frequencies to be noticeable |
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| differences in genetic structure between populations because some environmental factor is different from one place to another |
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| graded change in some trait along a geographic axis |
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Definition
| ability of natural selection to maintain diversity in a population |
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Definition
| when hybrid individuals have a greater survivorship and reproductive success than any type of homozygote (sickle cell anemia) |
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| frequency dependent selection |
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| reproductive success of any one morph (variety) declines if that phenotypic form becomes too common in the population. |
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| variation among individuals that seems to confer no selective advantage over others |
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| contribution of a genotype to the next generation compared to the contributions fo alternate genotypes |
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Definition
| acts against extreme phenotypes and favors the more common intermediate variants |
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Definition
| most common during periods of environmental change-shifts the makeup of a population by favoring varients of one extreme |
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| favors variants at opposite extremes over intermediate phenotypes |
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Definition
| distinction between secondary sexual characteristics of males and females |
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Definition
| selection of a mate based on secondary sexual characteristics |
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