Question

Which of the following was necessary for the evolution of beak size on Daphne Major:

A) beak size had to be at least partially determined by the additive effects of alleles
B) characteristics of the average seed had to change from year to year
C) individuals with smaller beaks had to grow larger beaks during drought years
D) a and b are correct
E) a, b, and c are correct

Answer 1

The evolution of beak size on Daphne Major was influenced by factors such as the additive effects of alleles and changes in the characteristics of the average seed. Birds with smaller beaks died during a drought period, while birds with larger beaks survived and reproduced, resulting in an increase in the average beak size in the finch population.

Step-by-step explanation:

The evolution of beak size on Daphne Major was influenced by factors such as the additive effects of alleles and changes in the characteristics of the average seed.

During a drought period, birds with smaller beaks were at a disadvantage as they could only eat smaller seeds, while birds with larger beaks could crack and eat seeds of all sizes.

As a result, the smaller-beaked birds died, and the larger-beaked birds survived and reproduced. This led to an increase in the average beak size in the finch population. Therefore, both options A and B are correct.