00:01
When a population is small, there is a greater chance of a certain phenomenon happening.
00:06
And as we all know in microevolution, one of the most common phenomenons that occur when a population is small is genetic drift.
00:14
So genetic drift is basically a phenomenon where a random event changes the allele frequency.
00:21
So we have something like the original population.
00:24
And in this case, we have something called bottleneck effects.
00:26
Where a random number of individuals is killed off in a population due to some sort of natural disaster or famine, and we are left with a very smaller population that does not have the same allele frequencies as the original population.
00:46
So the reason why genetic drift is particularly effective in small populations is, for example, let's say we have a hundred individuals or actually let's say we have 50 individuals that means we have a hundred alleles right for one gene that is mandeoian so as opposed to let's say we have 500 individuals in a population that means we would have a thousand alleles so if something wipes off the populace wipes away the population and five individuals are killed at random from this 50 individual population, that is 10 alias, which is 10 % of the gene pool.
01:43
Now as opposed to, let's say, five individuals are killed off in a population of 500.
01:51
That means that only 10 out of a thousand, 10 out of a thousand in the gene pool...