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| Differential reproduction and survival of individuals that results in elimination of maladaptive traits from a population. |
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| Genetic contribution by an individuals's descendants to to future generations. |
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| The proportion of phenotypic variability that is due to genetic variation among individuals. |
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| Genetic constitution of an organism. |
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| Physical expression of a characteristic of an organism, determined by both genetic constitution and environment. |
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| A genetically determined characteristic (behavioral, morphological, or physiological) that improves an organism's ability to survive and reproduce under prevailing environmental conditions. |
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| changes in physiological state or tolerance that appear in a species after long exposure to different natural environments. |
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| Unit material of inheritance; more specifically, a small unit of a DNA molecule, coded for a specific protein to produce one of the many attributes of a species. |
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| Gene form expressed in either the homozygous or heterozygous state. |
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| Gene form expressed only in the homozygous state; masked by the dominant allele in heterozygotes. |
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| The proposition that genotypic ratios resulting from random mating remain unchanged from one generation to another, provided natural selection, genetic drift, and mutation are absent. |
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| Random fluctuation in allele frequency over time, due to change alone without any influence by natural selection; important in small populations. |
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| Change in gene frequency through time resulting from natural selection and producing cumulative changes in characteristics of a population. |
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| Ability to change form under different environmental conditions. |
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