10.3 Gene pool and speciation
IB Syllabus Statements
Understandings:
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A gene pool consists of all the genes and their different alleles, present in an interbreeding population.
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Evolution requires that allele frequencies change with time in populations.
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Reproductive isolation of populations can be temporal, behavioural or geographic.
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Speciation due to divergence of isolated populations can be gradual.
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Speciation can occur abruptly.
Applications and skills:
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Application: Identifying examples of directional, stabilizing and disruptive selection.
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Application: Speciation in the genus Allium by polyploidy.
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Skill: Comparison of allele frequencies of geographically isolated populations.
Video
Species and Speciation
Types of Evolution
Polyploidy leads to speciation
Types of Natural Selection
Comparison of Allele Frequencies of Geographically Isolated Populations
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Topic 10.3 Gene pools and speciation HookED SOLO Hexagons
Topic 10.3 Gene pools and speciation SSaQ (Syllabus Statement as Questions)
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How can polyploidy explain patterns of chromosome number in some genera?
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Define gene pool.
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Explain why evolution requires that allele frequencies change with time in populations.
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Explain temporal, behavioral, and geographic reproductive isolations of populations.
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Explain how speciation can be gradual or abrupt.
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What is implied by punctuated equilibrium?
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Outline how you would identify examples of directional, stabilizing, and disruptive selection.
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Explain speciation in the genus Allium by polyploidy.
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Explain how you would compare the allele frequencies of geographically isolated populations.
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Outline the benefits of polyploidy in crop species.