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20 Cards in this Set
- Front
- Back
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Speciation |
The process of producing new species |
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What is a species? |
A fundamental biological unit |
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Species plot |
Graph of individuals on a plot as dots that cluster together and those clusters represent species |
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Biological Species Concept (BCS) |
Groups of actually or potentially interbreeding populations that are reproductively isolated from other such groups |
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Morphospecies concept |
Members of the same species look similar |
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Ring species |
Gene flow occurs through a ring of populations |
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Ecological Species Concept (ESC) |
Species cannot coexist in the same location if their ecological niches are too similar |
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Evolutionary Species Concept (EvSC) |
Members of a species all have a common ancestor |
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2 categories of reproductive isolation |
Pre-zygote and post-zygote |
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Pre-zygote reproductive isolation |
Isolation before fertilization. Isolation through behavior, physical compatability, time, and space/location |
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Post-zygote reproductive isolation |
Isolation after fertilization. Creates genetic incompatibility, different numbers of chromosomes. Zygote may or may not form and are sterile |
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Allopathic Speciation |
A physical barrier separates 2 popularions. 2 types |
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Dispersal-Derived Speciation/ Perpatric Speciation |
Dispersal from a mainland to new locations and the populations evolve differently |
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Dispersal Derived Speciation/ Adaptive Radiation |
Rapid evolution in which natural selection accelerates Speciation and adaptation (environmental changes) |
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Variance Derived Speciation |
Speciation attributed to a specific date that something arose |
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Co-speciation |
2 groups of organisms speciation in response to eachother and at the same time |
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Sympatric Speciation |
Populations in the same location speciation due to natural selection and genetic divergence |
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Instantaneous speciation |
Usually caused by hybridization. When the offspring are isolated from the parent |
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Does natural selection always lead to speciation? |
No |
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2 ways of natural selection |
Sympatric: disruptive natural selectio. Allopatric: Facilitated by natural selection. |
