The two mice are different from one another due to their different parents so in that way the physical features of both mice are different from one another. Both mice have the same protein for whisker thickness in their cells that leads to same whisker in both mice. The common feature in both mice are the protein that is responsible for whisker thickness so both have same whisker on their face.
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.