A mainland and an island are both inhabited by brown and white mice. Allele A1 c

Question

A mainland and an island are both inhabited by brown and white mice. Allele A1 codes for brown coat color; allele A2 codes for white coat color. A1 is dominant to A2 .

Mice do not swim between the mainland and the island, and there are no shipping routes to the island, thus mice cannot hitch a ride on ships. During storms, however, some mice get “rafted” to the island on logs.

The island contains 240 mice. The frequency of the A1 allele is 0.85; the frequency of the A2 allele is 0.15.

On the mainland, the frequency of the A1 allele is 0.55; the frequency of the A2 allele is 0.45.

During a severe storm, 60 mice from the mainland are rafted to the island. What are the new frequencies of A1 and A2 on the island after the storm?

Enter your answer as two numbers (each to two decimal places), separated by a comma. (Example: 0.56, 0.44)

Explanation / Answer

The frequency (f) of an allele A = number of copies (i)/ population or sample size (N)

f = i/N.

= i = f * N

Island

=0.85*240

= 204 A1

= i = f*N

=0.15 *240

36

Mainland

= 0.55 * 60

33 A1

=0.45 * 60

27 A2

New Frequency of A1

f = i/N.

204+33/300

0.79 A1

36+27/300

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