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Answered 2011-03-06 00:50:14

The 4 types of genetic variation are

1) mutation- is the mutation of a gene. this is really rare, most mutations are in the recessive trait so they are hidden by a dominant trait. Most mutations have no effect but some can be harmful and very few have positive effects. There is a lot more on mutation so i suggest you look it up.

2) Genetic recombination- is the formation of new conbinations of alleles during sexual reproduction. This happens alot during crossing over. Every one is different because you get a mix of genes from your mom and dad.

3) migration- is when an individual who moves into a population brings different genes that may not be present in the population, it has the most effect on a small population.

4) Genetic drift- when a few individuals have a trait that the rest of the population doesn't have and if these organisms die off without mating, then they die in the gene pool. this reduces variation in a population so it makes less evolution

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