How are gene frequencies affected by migration

• Introduces more copies of genes in the population increasing the proportion of certain gene the population
• Introduces new genes in the population that have risen by mutation of these new have a selective advantage, then their proportion in the population increase
• Leads to loss of genes from the population reducing their proportions and may lead to total loss of genes from a small population if the one/few individuals that possess a certain gene vacates. This reduces the proportion of the lost genes to zero.

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Dr. Bbosa Science