2. Scale coloration of lizards has a complete dominance...

2. Scale coloration of lizards has a complete dominance relationship where green scales are dominant over blue scales. There are 1,024 individuals with the genotype GG, 512 individuals with the genotype Gg, and 64 individuals with the genotype gg. a. Calculate all three genotype frequencies. Record your answers to TWO decimal places. b. Calculate the dominant allele frequency and recessive allele frequency in this population. Record your answers to TWO decimal places.

Transcript

00:01 We're looking at a population of lizards, and we know exactly how many individuals have each genotype.

00:07 So we have the homozygous dominant, heterozygous, and homozygous, recessive.

00:16 There are 1 ,024, there are 512, and there are 64.

00:23 The first thing we want to do is work out the genotype frequencies.

00:27 So to work out the frequency, what we're going to do is add all of these.

00:31 Up.

00:32 So we have 1 ,600 lizards in total.

00:37 The frequency of this genotype is going to be the proportion of the total lizards that has this genotype.

00:46 So we take our thousand and twenty four and we divide it by the total number.

00:51 And we get 0 .64.

00:56 And then we're going to do the same thing for the others.

01:00 So divide each of them by the total number.

01:13 This one is going to be 0 .32, and this one is whatever is left, and also it's 0 .04.

01:22 So these are the genotype frequencies.

01:25 Next, we need to work out the allele frequencies.

01:29 How are we going to do that? okay.

01:33 So now we're going to stop thinking of this as a population of lizards, and start thinking as a population of alleles.

01:40 Each lizard has two copies of the gene, two alleles.

01:44 So that's 3 ,200 copies.

01:49 64 % of the lizards have two copies.

01:54 So to work out the allele frequency, we're actually gonna add up how many copies are in the population.

02:02 So we start with this.

02:09 We will take our 1 ,024 and we'll double it because these lizards have two copies each.

02:15 So they represent 2 ,048 copies of the dominant allele...

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