Question

A population contains equal number of individuals with the genotype AA and Aa. Proportion of allels A & a in their gemetes will be :

• A. 3 : 1
• B. 1 : 1
• C. 1 : 2
• D. can't be determined

Answer 1

The correct option is A 3 : 1

With the parent organism to be AA and Aa in the population, we get gametes from these parents as:

From AA: A and A

From Aa: A and a

So out of four formed gametes proportion of 'A' and 'a' in them is 3:1, as 3 gametes are of 'A' allele while 1 is of 'a' allele.

So, the correct answer is '3:1'.