In a certain population of rats, brown fur coloring is dominant to gray. if you have 112 brown rats in a population of 200 rats (with the rest of them being gray), what is the predicted frequency of homozygous dominant rats?
a. 0.11
b. 0.45
c. 0.54
d. 0.15

Option A

Explanation:

Given -

Total population of rats

Out of the total population, number of rats with brown fur

Thus , the frequency of brown fur rats

It is also given that the brown fur rats are dominant to gray fur rats.

As per Hardy Weinberg's equation,

Frequency of dominant rats is given by

and here

Thus,  

Frequency of homozygous recessive gray rat

Hence,

frequency of homozygous dominant rats

Hence, option A is correct