Question

In the year 2500, five male space colonists and five female space colonists from Earth settle on an uninhabited Earth like planet in the Andromeda galaxy. The colonists and their off-spring randomly mate for generations. All ten of the original colonists had free earlobes, and two are heterozygous for that trait. The allele for freeear lobes is dominant to the allele for attached ear lobes.

Required:
What is the allele frequency in the founding population?

Answer 1

Answer:

The correct answer would be - 0.1 a, 0.9 A

Explanation:

The initial population of the colonist had free earlobes which are represented by A here as it is dominant and attached is represent by a. purebred dominant would have AA.

Frequency of allele A =

8 pure dominant and 2 heterozygous dominant presents in the population

So, frequency of A allele = 8 x 2 + 2 / 20

= 18/20

= 0.9

As we know

p+q=1;

frequency of allele "a" = 1-p

= 1-0.9

= 0.1