Question

The beak size in a species of bird is influenced by a gene for which only two alleles exist. The allele that results in a large beak is dominant to the allele that results in a smaller beak. If introduction of a new food source causes the birds with smaller beaks to be better fit to survive, which of the following will most likely happen?
The allele for small beaks will become dominant to the allele for large beaks.
The bird population will decrease as the recessive allele becomes more common.
The birds with large beaks will die out as a result of lack of food.
The frequency of the allele that results in small beaks will increase.

Answer 1

Answer:

I think that the birds with large beaks will die out as a result of lack of food. (c)

Explanation:

If the smaller birds are better fit to survive then selective pressures should decrease the number of birds with larger beaks.