Answer:
I don't speak English, I only translate, I'm sorry, but you like Kunno, I know, hush, I said hush, I don't talk to Kunno fans
This can be solved either by using a Punnet Square or you can use the formula (n(n+1))/2, where n is the number of alleles. However, using either method will give you the number of possible genotypes regardless if it's homozygous or heterozygous. If we use the second formula, that will give you 10 possible genotypes. Since you only want to know the number of heterozygous genotypes, you should subtract the number of possible homozygous genotypes. In this case, there are four. That is (A1,A1), (A2,A2), (A3,A3), and (A4,A4). Knowing this, you'd be able to figure out that there are six heterozygous genotypes.
(A1,A2), (A2,A3), (A3,A4), (A1,A4), (A1,A3), (A2,A4)
Extinction of other species will negatively affect human society by affecting multiple things. One thing that may happen is that the ecosystem will fail, and it will eventually become a bare wasteland,n destroying possible recources for humans. As well, if humans have a direct use for them, such as cows for milk, or pics for bacon and ham, those direct recourses will deplete humans recourses, and there may be riots, or the population dwindling because of a lack of recourses. as well, some helpful animals such as plants go extinct, then no oxygen will be exchanged through photosynthesis, and it would cause a lot of pollution,
