Artificial Selection
- Created by: book.of.wisdom
- Created on: 25-02-22 20:48
Principles and uses
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Selective breeding of organisms
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Humans choosing desired phenotypes
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Only interbreed organisms with desired phenotypes
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Therfore selecting the genotypes that contribute to the gene pool of next generation
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They continue to carry this process over many generations
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Examples:
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Cows- high milk yield, more docile
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Sheep- finer quality wool
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Dogs- better eyesight/hearing for hunting
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Cats- more docile, shorter claws
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Inbreeding depression and hybrid vigour
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Genetic diversity is reduced in gene pool
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Harmful alleles become more frequent
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Reduces chance of survival if environment were to change (e.g. new pathogens introduced)
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Inbreeding depression can occur (closely related individuals inbred)
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To overcome this, we need to outcross individuals with different varieties
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Increasing heterozygotes is called “hybrid vigour”
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Need to…
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