Below is an image of a family tree (first generation) showing a group of mice. A dark gray mouse and a white mouse had four offspring, some had white fur, while others had dark gray fur. Use the image below to help you answer the following questions. Which of the following descriptions about the parents is most likely true? A Their gene combinations for the fur color trait are the same.

B Their gene combinations for the fur color trait are different.

C Their gene combinations for the fur color trait depend solely on the environment.

D Their gene combinations for the fur color trait do not affect their offspring.