00:01
Okay, in order to answer this question, let's talk about inheritance.
00:04
This is a large population of land turtles on isolated iceland has two alleles for a gene that determines shell thickness.
00:13
The allel for thinner shells is dominant over the allel for thicker shells.
00:17
So let's suppose this is a dominant allele.
00:20
This allele is for thinner shells, thinner alleles.
00:30
And the recessive allele is the thicker shells allele.
00:39
Now it says the thinner shell allele occurs at a frequency of 20%, assuming there is no net advantage to thick or thin shells, what should the frequency of homocygous thicker shell are those being the population? so here you have to apply hardiweimer equilibrium.
00:55
Okay, remember that according to hardikwemar equilibrium, you have that p plus q is equal to 1, where p is the frequency of alleys in the population that are dominant alleles, and q is the frequency of alias in the population that are recessive, and also you have that p -square plus 2pq plus q squared is equal to 1, where p -square is the frequency of individuals in the population that are homo -sigo -degos dominant.
01:24
2 -p -q is the frequency of individuals in the population that are heterocygose.
01:28
And q -square is the frequency of individuals in the population that are homozygos.
01:33
In this case, it says that the thinner shell allele, it means this allele here, the allele, okay, not that genot.
01:40
The allele occurs at the frequency of 20%...