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15 Cards in this Set
- Front
- Back
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Artificial selection
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nature provides variation and humans select those variations they find useful
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struggle for existence
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members of each species competge regularly to obtain food, living space, and other necessities of life
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fitness
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ability of an individual to survive and reproduce in its specific environment
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adaptation
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any inherited characteristic that increases an organism's chance of survival
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survival of the fittest
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individuals that are better suited to their environment survive and reproduce more successfully
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natural selection
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takes place without human control or direction
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descent with modification
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living species has descended with changes from other species over time
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common descent
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all species were derived from common ancestors
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homologous structres
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structures that have different mature forms but develop from the same clumps of cells in embryos
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vestigial organs
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organs of many animals are reduced in size that they are ust traces of homologous organs in other species
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gene pool
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consists of all genes that are present in a population
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relative frequency
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the number of times that the allele occurs in a gene pool compared with the number of times other alleles for the same gene occur
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single-gene trait
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controled by a single gene that has two alleles
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polygenic traits
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traits that are controlled by two or more genes
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sources of genetic variation
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muations and gene shuffling
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