Term
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Definition
| : Ernst Mayr "...groups of actually or potentially interbreeding natural populations that are reproductively isolated from other such groups |
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Term
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Definition
| Individuals that cannot produce fertile offspring and members of different species |
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Term
| Application Problems with definition of species |
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Definition
1. Difficult to apply to species that reproduce asexually.(example: bacteria)
2. Difficult to apply to populations that do not occur together in nature. |
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Term
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Definition
| same distinct entities phenotypically different. Same location, often use different parts of the habitat. - Two species that occur together and are nearly identical |
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Definition
| Populations of a single species that occur in different areas. May be classified as a subspecies or a variety. |
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Definition
| geographically separated populations. Squirrels on North + South Rims of the Grand Canyon. |
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| 2 General types of Reproductive Isolation |
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Definition
| Prezygotic and Postzygotic |
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Term
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Definition
| fertilized egg starting development. Prevention of fertilization or viable zygote. |
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Term
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Definition
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| Types of prezygotic isolating Mechanisms |
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Definition
| Ecological Isolation, Behavioral Isolation, Mechanical Isolation, Prevention of Gamete Fusion, and Temporal Isolation. |
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Term
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Definition
| Physical Seperation: different organisms use different parts of the environment-they don't encounter one another in nature. |
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Term
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Definition
| Courtship Rituals among birds, certain insects, and amphibians. |
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Term
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Definition
| Structural differences in reproductive organs. |
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| Prevention of Gamete Fusion |
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Definition
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Definition
| difference in the timing of breeding seasons |
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Term
| Types of postzygotic isolating mechanisms |
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Definition
| Hybridization, Hybrid sterility, abnormal sex organ development, chromosomal alterations. |
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Term
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Definition
| Two identical populations must diverge, Reproductive isolation must evolve to maintain difference between the two populations. |
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Term
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Definition
| occurs in plants via Autopolyploidy, and allopolypoidy. |
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Term
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Definition
| all chromosomes are from single species |
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Term
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Definition
| 2 different species hybridize |
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Term
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Definition
| half lifecycle as a sporophyte half as gametophyte=alteration of generations |
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Definition
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Definition
| attached to and nutritionally dependent on the female gametophyte |
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Term
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Definition
| generally small and require water to reproduce sexually, can reproduce asexually |
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