Term
| Gene flow consists of the movement of alleles among ________ |
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Definition
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Term
| Gene flow tends to ______ differences b/w populations over time and is _____ likely to alter allele frequencies directly. |
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Definition
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Term
| Gene flow is a ___________ force |
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Definition
| homegizing: mixes things up until allele frequencies are the same across populations. |
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Term
| Biological Species Concept |
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Definition
| Mayr defines a species as a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring. |
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Term
| Limitations of the Biological Species Concept |
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Definition
| Cannot be applied to asexual organisms, fossils, hybridized offspring. |
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Term
| Morphological Species Concept |
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Definition
| Characterizes a species in terms of its body shape, size and structural features. |
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Term
| Phylogenetic Species Concept |
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Definition
| Defines a species as a set of organisms with a unique genetic history |
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Definition
Species are definied by morphological traits alone and used by paleontologists to define fossils.
Limitations include:similarity between species |
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Definition
| A new species forms while geographically isolated from its parent population. |
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Definition
| The emergence of a reproductive barrier isolates a subset of a population without geographic separation |
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Definition
| Populations that abut one another diverge, usually in response to some strong ecological gradient. |
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Definition
| An individual that has more than two chromosome sets, all derived from a single species. Can't have odd # chromosomes. |
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Definition
| The presence of extra sets of chromosomes in cells due to accidents during cell division and results in reproductive barriers b/w different ploidy levels. Has caused the sympatric speciation of many plant species. |
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Definition
| Two parental species that hybridize |
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Term
| Prezygotic/Postzygotic barriers |
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Definition
Impede mating b/w species or hinder the fertilization of ova if members of different species attempt to mate
Often prevent the hybrid zygote from developing into a viable, fertile adult. |
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Term
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Definition
The evolutionary history of a species or group of related species.
The ordered division and naming of organisms. |
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