Term
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Definition
| the process in which a species splits into two |
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Term
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Definition
| changes in allele frequency of a population over time |
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Term
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Definition
Broad patterns of change above the species level
Example: the emergence of mammals or flowering plants |
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Term
| Biological Species Concept |
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Definition
| a species is a group of populations whose members have the ability to interbreed in nature and produce fertile offspring |
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Term
| Define prezygotic barriers |
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Definition
| Barriers that prevent fertilization |
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Term
| Temporal/Habitat Isolation |
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Definition
| keeping members of different species apart geographically to prevent fertilization |
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Term
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Definition
Prevent mating because of behvaior
Example: different animals mate at different times of the year |
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Term
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Definition
| Mating attempt happens but sperm and egg do not fuse together |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Hybrids cant produce offspring |
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Term
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Definition
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Term
| Problems with the biological species concept |
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Definition
| 1. cannot be applied to fossils or asexual organisms 2. gene flow is absent 3. hybrids are common in nature |
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Term
| Morphological Species Concept |
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Definition
| defines species by phenotypic features; is subjective |
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Term
| Ecological Species concept |
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Definition
| Views species in terms of its ecological niche |
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Term
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Definition
| New species form when a population is separated from the parent population |
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Term
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Definition
| New species forms with no separation |
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Term
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Definition
| accidents in cell division creates precense of extra set of chromosomes |
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Term
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Definition
| Individuals with more then two pairs of extra chromosomes from one species |
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Term
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Definition
| Individuals with more then two pairs of extra chromosomes from multiple species |
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Term
| True or False: Sexual selection can drive sympatric speciation |
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Definition
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Term
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Definition
| a region in which different species mate and produce hybrids |
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Term
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Definition
| Weakening of reproductive barriers that end in both species going back to a single species |
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Term
| Hybrid Zones: Reinforcement |
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Definition
| Strengthening reproductive barriers so less hybrids are produced |
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Term
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Definition
| Continued formation of hybrids |
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