In a certain population of elephants, 125 are gray, 50 are grayish-brown, and 25 are brown. The allele for gray is G, the allele for brown is g, and these two alleles show incomplete dominance relative to each other.

What is the GG genotype frequency in the existing population?

Answer
a.
0.625
b.
0.5
c.
0.25
d.
0.125

Question

In a certain population of elephants, 125 are gray, 50 are grayish-brown, and 25 are brown. The allele for gray is G, the allele for brown is g, and these two alleles show incomplete dominance relative to each other.

What is the GG genotype frequency in the existing population?


Answer
	 a.	
0.625
	 b.	
0.5
	 c.	
0.25
	 d.	
0.125

alphadxg · Answer

I know the answer, I wan't to make sure.

solidicecream · Answer

So the answer is a. 0.625 I am right?

alphadxg · Answer

Well, that would be the ratio between them, yes, but it's asking for the genotype frequency so it's going to be different.

solidicecream · Answer

Oh ok.... lets see.

alphadxg · Answer

Lets think this logically, the ratio's are 5:2:1 because there is a common factor of 25.

alphadxg · Answer

That is the phenotype ratio

solidicecream · Answer

Dang well I am not really good when it comes down to things like this so I really don't know. I think it could be b. 0.5 but I am not really sure sorry.

alphadxg · Answer

@shreehari499 @Abhisar @aaronq

aaronq · Answer

$\dfrac{125}{125+50+25}$ ?

aaronq · Answer

you wouldn't use a punnett square, there is no need because it's not asking you to predict the offpring from the population. it's asking about the frequency of the GG genotype (which is essentially the grey phenotype as well) IN the given population, not the G allele.

So GG = 125, total =200, thus f(GG)=$\dfrac{125}{200}=0.625$