Term
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Definition
| When mating is not random, it violates the Hardy Weinburg Principle and thus varies from the hardy weinburg equilibrium. |
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Term
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Definition
| When mating idividuals are more closely realted than those drawn at random |
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Term
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Definition
| When mating individuals are less closely related than those drawn at random. |
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Term
Change in allelic frequencies
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Definition
| Neither inbreeding or outbreeding cause changes in the allelic frequencies. |
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Term
| Changes in genotypic frequencies |
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Definition
| Both inbreedign and outbreeding do cause a change in genotypic frequencies. |
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Term
| Genotypic frequency changes inbreeding vs outbreeding |
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Definition
UNder inbreeding the frequencies of the homozygotes increase while the heterozygotes decrease.
Under outbreeding, the frequencies of the homozygotes decrease while the heterozygote increases. |
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Term
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Definition
THe mst extreme form of inbreeding, which occurs in many plants and only a few other organisms.
Under self fertilization the heterozygotedcreases 50% in each generation. |
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Term
| Reestablish original genotypic frequencies |
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Definition
| Since the underlying allelic frequencies do not change it only takes one generation of random mating to reestablish the original genotypic frequencies, even after 1,000 generations of self-fertilization. |
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Term
| Inbreeding depression: the coupling of inbreeding and selection |
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Definition
| Even though inbreeding by itself does not alter allelic frequencies in the population, the coupling of inbreeding and selection can significantly alter allelic frequencies, most typically throuh the phenomenon of inbreeding depression. |
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Term
| Deleterious recessive alleles |
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Definition
| Natural populaitons of most organisms (including humans) contain a significant number of deleterious recessive alleles. |
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Term
| Effect of deleterious recessive alleles |
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Definition
| The deleterious effects of these recessive alleles are masked in heterzygotes |
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Term
| Inbreeding's efect on deleterious recessive alleles. |
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Definition
| Since inbreeding results in an increase in the frequencies of homozygotes in the population, it means that a larger population will carry two copies of the deleterious allele causing the recessive trait to show more. |
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Term
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Definition
| When large proportions of the offspring carry two copies of the deleterious allele, mortality rates tend to be higher. |
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