Question

Twelve mutineers from HMS Bounty, all of whom bear the NN blood group, arrive at Pitcairn Island. The mutineers are met by 18 native women, all bearing the MM blood group. In time, the mutineers become integrated into island society. Assuming random mating, no mutation, no selection (based on blood type or linked genes), and no genetic drift, what would you expect the blood group distribution to be among the 100 people existing on Pitcairn Island two generations later?

a)MM = 0.36, MN = 0.48, NN = 0.16

b)MM = 0.25, MN = 0.50, NN = 0.25

c)MM = 0.16, MN = 0.48, NN = 0.36

d)MM = 0.70, MN = 0.01, NN = 0.29

e)MM = 0.90, MN = 0.05, NN = 0.052)

Answer 1

There is a lot of missing information in the question that could change the variables involved, but assuming all the females have MM blood group and all males have an NN blood group with both being dominant types, the distribution may be as follows. (This distribution is solely for the third generation islanders,i.e;2 generations from when the mutineers got integrated into the island society.)

Therefore option (b) is correct