IB Biology Topic 10: Macroevolution and Speciation

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13 Terms

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Directional selection
________ has the phenotypic distributed to two extreme phenotypes, ‘ two- hump graph.
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Disruptive selection
________ has phenotypic distribution entirely towards one phenotypic extreme.
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Fossil records
________ show abrupt changes in a species with periods of ‘ extinction that are perceived to be periods of stasis under the theory of punctuated evolution.
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rapid bursts
Punctuated equilibrium= when speciation occurs in short, ________ with periods of no change in between.
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Low genetic variation
________ /diversity implies that if one organism of such a population is vulnerable to a disease, the entire population is also vulnerable.
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Gene
________ pool= the combination of all alleles of a trait for a species.
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meiosis
Occurs when ________ does not occur correctly and the chromosomes are unable to be divided into two haploid gametes, and instead produce one diploid gamete by hybridization.
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Behavioral isolation
________= differences in mating behaviors that for two population.
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Sympatric speciation
________= occurs w /out a geographic barrier.
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Temporal isolation
________= differences in mating times for two different populations.
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Speciation
________ is the development of different species.
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Gradualism
________= when speciation occurs gradually over time.
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Species
________= a group of organisms that can mate and reproduce and produce viable and fertile offspring.