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Unformatted text preview: The genetic (alleleic) makeup of an organism with regard to an observed trait. geographic isolation Separation of populations of a species by geographic means (distance, mountains, rivers, oceans, etc.) that lead to reproductive isolation of those populations. geographic range The total area occupied by a population. geological time The span of time that has passed since the formation of the Earth and its physical structures; also, a timescale that focuses on events on the order of thousands of years or more. geotropism Plants' response to gravity: roots grow downward, showing positive geotropism, while shoots grow upward in a negative response. germ cells Collective term for cells in the reproductive organs of multicellular organisms that divide by meiosis to produce gametes . gestation Period of time between fertilization and birth of an animal. Commonly called pregnancy....
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- Fall '10