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14 Cards in this Set
- Front
- Back
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What is inbreeding? |
Higher than chance mating between relatives |
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What is outbreeding? |
Lower than chance mating between relatives |
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What is assortative mating? |
More traits in common |
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What is disassortative mating? |
Fewer traits in common |
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Describe the mating habits of the Northern Elephant Seals |
A few dominant males compete for a harem of females |
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Describe the mating habits of lions |
Young males outed from the group and later compete with other pride leaders. |
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What does MHC tell us about mating? |
Highly polygenic - different MHC complexes were found to be 'attractive' |
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Give four types of inbreeding |
Self fertilisation Parent sibling mating Brother sister mating Cousin mating |
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Give four consequences of inbreeding |
1. Variation is lost as heterozygotes are lost - population may become 'fixed' for one allele 2. Effects more pronounced in small populations 3. Loss of variability can hamper evolution 4. Increased homozygosity can promote incidence of genetic abnormalities |
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What is the inbreeding coefficient (F)? |
The proportionate loss of heterozygotes compared to Hardy Weinberg expectation |
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What does an F value of 0 indicate? |
Three genotypes of Hardy Weinberg remain (homozygous recessive, homozygous dominant, heterozygous) |
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What does an F value of 1 indicate? |
Only homozygotes remain |
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What does inbreeding do to harmful recessive traits in a population? |
Brings them together so they become expressed |
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What is heterosis? |
Breeding two inbred lines to produce a stronger F1 generation |
