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11 Cards in this Set
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- Back
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What mechanisms prevent mating between species?
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Pre-zygotic reproductive barriers prevent mating or fertilization.
Post-zygotic (occurs after the egg has been fertilized) reproductive barriers prevent embryo or fetus development, or result in infertile offpsring. |
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What are pre-zygotic reproductive barriers?
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Pre-zygotic reproductive barriers prevent mating or fertilization.
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What are post-zygotic reproductive barriers?
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Post-zygotic (occurs after the egg has been fertilized and the zygote has been formed) reproductive barriers prevent embryo development or fetus development or result in infertile offspring.
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Which mechanism is more common?
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Data shows that pre-zygotic mechanisms are more common.
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Explain pre-zygotic reproductive isolation due to habitat isolation.
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Habitat isolation:
There is no physical contact among two or more species that inhabit the same area since they favor different habitats. |
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Explain pre-zygotic reproductive isolation due to temporal isolation.
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Temporal isolation:
Each species reproduces during different times of the day, different seasons, or different years. |
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Explain pre-zygotic reproductive isolation due to behavioral isolation.
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Behavioral isolation:
Different species have incompatible courtship and mating rituals that prevent mate recognition. They perform different forms of behavior that allow their own kind to identify them. |
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Explain pre-zygotic reproductive isolation due to mechanical isolation.
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Mechanical isolation:
Anatomical differences (structrual incompatibility) prevent mating between different species. |
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Explain pre-zygotic reproductive isolation due to gametic isolation.
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Gametic isolation:
Foreign sperm cannot recognize the egg. Foreign sperm cannot penetrate the egg. Foreign sperm cannot survive in the female reproductive tract. |
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What is the speciation gene in mice?
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PRDM9
Male hybrids inherit two incompatible alleles at the PRDM9 gene that disrupt the sperm formation resulting in sterility. |
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How can mutations lead to speciation?
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Mutations in genes that control the rate, pattern, or time of development can alter phenotype and lead to speciation.
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