Slight differences in inherited traits, such as feather color in birds, are called
a. variations.
b. adaptations.
c. mutations.
d. differential traits.

The answer is letter C. |

Slight differences in the color of feathers in birds are the result of mutations. Mutation is process that occurs through a long period of time. It is a process in which the genes’ structures changes thus altering the physical characteristics and behaviors of species. This results into variant forms that may be transmitted to the next generations of species. Mutation is caused by an alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of the genes or chromosomes. 

The answer is a: the eggs have half as many chromosomes as the body cells