00:01
So today the question we have is what are the four major forces affecting the evolution of natural population? for each force, what is its effect on genetic diversity? and how does each force alter genetic diversity? right.
00:17
So, you know, there are four forces of evolution, mutation, chain flow, genetic drift, and natural selection.
00:26
So let's just talk about the.
00:30
Natural selection right so natural selection is the process by which the best adapted individual produce the most offering best adapted produced most offspring right so which in turn carry forward to their offsprings the genes that gave their parent the upper edge it is increased genetic diversity.
01:11
So next is the genetic drift, right? so genetic drift is a random process in which chance plays a role in deciding which gene variants survive, right? so it decreases genetic diversity.
01:40
Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.
01:48
It can also cause initially rare alleles to become much more frequent and even fixed.
01:56
When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies, the effect is smaller.
02:05
Genetic drift can result in the loss or rare alleles and can decrease the size of gene pool...