Drew Fish Overpopulation Effect

There are few factors that can alter the proportion of homozygotes and heterozygotes in a population: genetic drift, gene flow, mutation, and natural selection. Genetic drift is the change in the gene pool that occurs in a small population due to chance. For example, let's say we are talking about a species of fish called Drew fish, well the Drew fish population was hit by an oil spill and many of them died. The remaining survivors form new colonies, and this results in genetic drift, the founder effect. Gene flow is about the movement of alleles. Well let's say a Prow Fish began to mate with the Drew fish this will bring about some gene flow because these Prow Fish are just the same species as Drew fish but a different population with different alleles, so they have yellow fins as oppose to blue.

Mutation is a change in the organism's DNA. This change causes the gene pool too to change in an individual. It is rare, but it can have a cumulative effect over time. Mutations are uncommon but the source to all real new changes, but overall the new alleles rely on natural selection and genetic drift. If Drew Fish had a mutation that gave it legs and it began to mate with a member of the population it will be introducing a new gene to the population gene pool. Natural selection can cause change because in reproduction in which preferred Drew Fish mate can cause an increase in numbers of homozygous individuals in the population. Populations in a species consist of different genetic makeups, some of them are more successful at leaving offspring than