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| An axiom maintaining that the sexual shuffling of genes alone cannot alter the overall genetic makeup of a population. |
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| Greater reproductive success of heterozygous individuals compared to homozygotes; tends to preserve variation in gene pools. |
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| Structures in different species that are similar because of common ancestry. |
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| Similarity of the nucleotide sequences of DNA or RNA molecules, or the amino acid sequences of proteins. |
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| A rare change in the DNA of a gene ultimately creating genetic diversity. |
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| Differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment. |
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| Parallel evolution is the development of a similar trait in related, but distinct, species descending from the same ancestor, but from different groups of species. |
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| The coexistence of two or more distinct forms of individuals in the same population. |
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| A theory of evolution advocating spurts of relatively rapid change followed by long periods of stasis. |
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| The contribution of one genotype to the next generation compared to that of alternative genotypes for the same locus. |
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| A special case of polymorphism based on the distinction between the secondary sex characteristics of males and females |
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| Selection based on variation in the secondary sex characteristics, leading to the enhancement of sexual dimorphism. |
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| The origin of new species in evolution. |
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| A group whose members possess similar anatomical characteristics and have the ability to interbreed. |
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| Natural selection that favors intermediate variants by acting against extreme phenotypes. |
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| A mode of speciation occurring as a result of a radical change in the genome of a subpopulattion, reproductively isolating the subpopulation from the parent population. |
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| Sstructures of marginal, if any, importance to an organism. They are historical remnants of structures that had important functions in ancestors. |
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| A reproductive barrier that impedes mating between species or hinders fertilization of ova if interspecific mating is attempted. |
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| The species remain isolated because they breed in different habitats. |
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| The species have differences in mating rituals. |
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| When different species reproduce at different times. |
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| The species are physically unable to reproduce. |
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| The gametes of the two species are chemically incompatible. |
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| Any of several species-isolating mechanisms that prevent hybrids produced by two different species from developing into viable, fertile adults. |
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| The offspring do not survive. |
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| The hybrids survive, but are infertile (can't reproduce). |
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| 2nd generation offspring are weak, sterile and can't/don't reproduce. |
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