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AP Biology

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
acquired characteristics   modifications caused by an individual’s environment that can be inherited by its offspring  
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adaptation   heritable trait or behavior in an organism that aids in its survival and reproduction in its present environment  
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adaptive radiation   speciation when one species radiates out to form several other species  
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allopatric speciation   speciation that occurs via geographic separation  
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allopolyploid   polyploidy formed between two related, but separate species  
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aneuploidy   condition of a cell having an extra chromosome or missing a chromosome for its species  
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autopolyploid   polyploidy formed within a single species  
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behavioral isolation   type of reproductive isolation that occurs when a specific behavior or lack of one prevents reproduction from taking place  
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convergent evolution   process by which groups of organisms independently evolve to similar forms  
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dispersal   allopatric speciation that occurs when a few members of a species move to a new geographical area  
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divergent evolution   process by which groups of organisms evolve in diverse directions from a common point  
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gametic barrier   prezygotic barrier occurring when closely related individuals of different species mate, but differences in their gamete cells (eggs and sperm) prevent fertilization from taking place  
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gradual speciation model   model that shows how species diverge gradually over time in small steps  
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habitat isolation   reproductive isolation resulting when populations of a species move or are moved to a new habitat, taking up residence in a place that no longer overlaps with the other populations of the same species  
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homologous structures   parallel structures in diverse organisms that have a common ancestor  
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hybrid   offspring of two closely related individuals, not of the same species  
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hybrid zone   area where two closely related species continue to interact and reproduce, forming hybrids  
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natural selection   reproduction of individuals with favorable genetic traits that survive environmental change because of those traits, leading to evolutionary change  
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polyploidy   gametes with extra chromosomes  
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postzygotic barrier   reproductive isolation mechanism that occurs after zygote formation  
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prezygotic barrier   reproductive isolation mechanism that occurs before zygote formation  
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punctuated equilibrium   model for rapid speciation that can occur when an event causes a small portion of a population to be cut off from the rest of the population  
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reinforcement   continued speciation divergence between two related species due to low fitness of hybrids between them  
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reproductive isolation   situation that occurs when a species is reproductively independent from other species; this may be brought about by behavior, location, or reproductive barriers  
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speciation   formation of a new species  
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species   group of populations that interbreed and produce fertile offspring  
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sympatric speciation   speciation that occurs in the same geographic space  
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temporal isolation   differences in breeding schedules that can act as a form of prezygotic barrier leading to reproductive isolation  
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theory of evolution   explains how populations change over time and how life diversifies the origin of species  
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variation   genetic differences among individuals in a population  
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vestigial structure   physical structure present in an organism but that has no apparent function and appears to be from a functional structure in a distant ancestor  
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vicariance   allopatric speciation that occurs when something in the environment separates organisms of the same species into separate groups  
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