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14 Cards in this Set
- Front
- Back
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The process by which one species splits into two or more species.
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Speciation
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The existence of biological factors that impede members of two species from producing viable, fertile offspring.
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Reproductive Isolation
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Barrier that blocks fertilization from occuring. (Before the zygote). Habitat ,Temporal , Behavioral and Gametic Isolation.
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Prezygotic Barriers
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Reduced hybrid viability, Reduced hybrid fertility and hybrid breakdown.
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Postzygotic Barriers
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Geneflow is interrupted when a population is divided into geographically isolated subpopulations.
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Allopatric Speciation
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Speciation occurs in populations that are not geographically separated.
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Sympatric Speciation
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A species may originate from an accident during cell division that results in extra sets of chromosomes.
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Polyploidy
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An individual that has more than two chromosome sets that are derived from a single species.
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Autopolyploid
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A fertile individual that has more than two chromosome sets as a result of two different species interbreeding and combining their chromosomes.
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Allopolyploid
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What are the three types of Ehlers-Danlos syndrome (EDS) and what types of mutations do they cause? Symptoms?
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Classic Type: type V collagen mutation (fibril associated collagen) - hyperextensive skin, delayed wound healing, joint hypermobility
Vascular Type: type III collagen mutation - ruptures in arteries, intestines, uterus Kyphoscoliotic Type: lysyl hydroxylase mutation - same as the classic type but you also get progressive scoliosis |
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Strengthening of reproductive barriers-Hybrids cease to be formed.
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Reinforcement
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Weakening of reproductive barriers-the two species fuse.
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Fusion
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Continued production of hybrid individuals.
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Stability
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Periods of apparent stasis punctuated by sudden change.
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Punctuated Equilibria
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