lecture_15_speciation_SW_updated

lecture_15_speciation_SW_updated - FromLastClass:...

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From Last Class: Causes of Specia4on Finding a mate/mating Fertilization Zygote Adult reproduction Speciation as a byproduct of normal evolution in one or more of these steps Premating Postmating, Prezygotic postzygotic
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From Last Class: Causes of Specia4on Finding a mate/mating Fertilization Zygote Adult reproduction Postzygotic isolation can be caused by genic D-M incompatibilities- side- effect of normal evolution (selection or drift)
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Alterna4ve: ‘Gene4c’ Specia4on Finding a mate/mating Fertilization Zygote Adult reproduction three other possibilities: chromosomal speciation, polyploidy, hybrid speciation
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Chromosomal rearrangements can be UNDERDOMINANT, causing hybrid sterility Fitness, AA: 1 Fitness, Aa: 0.1 Fitness, aa: 1
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PROBLEM: How can an underdominant rearrangement spread through a population? 1) Mayr’s founder event speciation really happens (I.e. genetic drift plays major role in spread)- possible for small, inbred populations 2) The rearrangements that spread are NOT underdominant
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Multiple Chromosome rearrangements can generate ‘chromosomal’ versions of Dobzhansky-Muller incompatibilities
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Multiple Chromosome rearrangements can generate ‘chromosomal’ versions of BDM incompatibilities
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Hybrids Between Species are oAen sterile due to lack of pairing between chromosomes Radish chromosome Cabbage chromosome
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Problems During Meiosis
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lecture_15_speciation_SW_updated - FromLastClass:...

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