I’ll give brainliest to the quickest answer. This is a bit long, I also put the images of what it says. Below is an image of a family tree (first generation) showing a group of mice. A dark gray mouse and a white had four offspring, some had white fur, while others had dark gray fur. Use the image below to help you answer the following questions.

One of the white offspring (from the first generation in the introductory text) mated with an unrelated white mouse. Below is a family tree (second generation) showing these parents and their offspring. The parents’ genotypes are also shown in this image.

Part A: Which best describes the light gray mouse’s genotype for the fur color trait?
1: A1A1A2
2:A2
3:A1A2
4:A1A1

Part B: Explain your reasoning.