Macroevolution Part 3 - Sympatric Speciation
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Last updated 3:25 PM on 10/6/22
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8 Terms
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Allopatric Speciation
The formation of new species in populations that are geographically isolated from one another.
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Parapatric Speciation
speciation pattern in which populations speciate while in contact along a common border
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Sympatric Speciation
The formation of new species in populations that live in the same geographic area
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Polyploidy
refers to instant
speciation which occurs in most
often in plants. The normal primrose is
diploid with 14
chromosomes. 2N = 14
• In this species there was
a total nondisjunction
event resulting in
primroses that are
tetraploid. 4N = 28
• These primroses cannot
successfully mate with
the diploid species.
speciation which occurs in most
often in plants. The normal primrose is
diploid with 14
chromosomes. 2N = 14
• In this species there was
a total nondisjunction
event resulting in
primroses that are
tetraploid. 4N = 28
• These primroses cannot
successfully mate with
the diploid species.
5
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Autopolyploidy
refers to the occurrence in which
the number of chromosomes doubles in the offspring due to
total non-disjunction during meiosis.
the number of chromosomes doubles in the offspring due to
total non-disjunction during meiosis.
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Allopolyploidy
a species with multiple sets of chromosomes derived from different species
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Gradualism
The theory that evolution occurs SLOWLY but steadily
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Punctuated Equilibrium
the hypothesis that evolutionary development is marked by isolated episodes of RAPID speciation between long periods of little or no change.
Note 
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