This example tells us that the number of alleles in 2 different gene pools are shown below, and we need to answer the following. So we have to answer these questions down here, but let's just look at our gene pools first. We have gene pool 1 with 400 big A alleles and 600 little a alleles, Gene pool 2 with 5,000,000 of each big A and little a alleles. Alright. So let's just remember this concept of a gene pool.
Usually, you're thinking about the alleles in an organism, but now we're trying to imagine taking all the alleles out of organisms, not worrying about what the individual organisms are like. We're just going to take all the different alleles in the population and put them in one big bag or one pool together. Alright. So knowing that, let's answer the questions.
Which population has a higher frequency of the little a allele? Well, we can see very clearly gene pool 2 has more little a alleles, but we're worried about the frequency here, how common it is. So just some real simple math. In gene pool 1, we have 600 little a alleles, and well 600 plus 400, we have 1,000 total alleles. Right?
So the allele frequency in gene pool 1 is going to be 0.6 little a alleles. In gene pool 2, well, you can see right away it's even. So it's 5,000,000 of those little a alleles divided by 10,000,000 total alleles, which is going to give you 0.5. Alright. So 0.6 or 60 percent of the alleles in gene pool 1 are the little a allele, while 0.5 or 50 percent of the alleles in gene pool 2 are little a alleles, which means that gene pool 1, it has the higher allele frequency.
Remember changes in allele frequency, that's gonna be our measure of evolution going forward. Alright. Now it says, based on these allele frequencies, can you tell which population has a higher frequency of heterozygotes? Why or why not? What do you think?
Well, we're gonna learn how to make that prediction and to predict which one you would think would have more heterozygotes, but right now we're just looking at alleles from a population. We don't know how those alleles are actually distributed in individuals. So here I'm gonna say no. We do not know how alleles are distributed among genotypes. Alright, and that's gonna be a lot of what we're going to do going forward.
Learning how we make those predictions, make predictions using genotypes and allele frequencies to understand how alleles sort of move through populations. Alright. More to come. I'll see you there.