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| random change in allele frequencies that occurs in small populations |
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| inherited characteristic that increases an organisms chance of survival |
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| form of reproductive isolation in which two populations reproduce at different times. |
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| separation of species or populations so that they cannot interbred and produce fertile offspring. |
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| form of natural selection by which the center of the curve remains in its current position; occurs when individuals near the center of a distribution curve have higher fitness than individuals at either end. |
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| organ that serves no useful function in an organism |
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| structures that have different mature forms in different organisms but develop from the same embryonic tissues. |
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| form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or streches of water. |
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| process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest |
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| process by which individuals that are better suited to their environment survive and reproduce most successfully; also called natural selection |
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| form of reproductive isolation in which two populations have differences in courtship rituals or other types of behavior that prevent them from interbreeding. |
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| form of natural selection which occurs when individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve. |
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| form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle. |
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| combined genetic information of all the members of a particular population |
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| situation in which allele frequencies remain constant |
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