Question

Question 36 5 pts Deaths of individuals due to the volcanic eruption could change the frequency of alleles in these very small island populations. However, unfortunately you do not have data on the allele frequencies before and after the eruption for any of these species. Based on your understanding of genetic change, do you expect that these three species (A, B, and C) would be affected by genetic drift? Why or why not? HTML Editora BIU A - A - I E 3 3 1 1 x x E. OVE GOD BLUTO . Paragraph O words

Answer 1

When disaster strikes, an ecosystem can change very quickly. When an event causes a drastic decreases in a population , it can cause a type of genetic drift called a bottleneck effect.

A bottleneck effect can be caused by a natural disaster, like an earthquake or volcano eruption. Today, it is also often caused by humans through over-hunting, deforestation and pollution.

When most members of a population die suddenly, genetic variation goes down and the frequencies at which different alleles are found in the population can change dramatically.

When disaster strikes, only a few random individuals make it out alive. Maybe it can only be either A,B or C.over time, the population grows again,but now the majority of members are either A,B or C any one and there can be a few of the one group from the other two. This is very different from the original population before the disaster happened.

This illustrates that when a bottleneck event happens, the variety in a population can decrease and the proportions of different alleles can change completely.