You are forgetting the question but I can help you understand the exercise.
For this exercise it's important to know that there are more than one gene that causes albinism. In this exercise, one of the parents is albino because of one gene( gene A) and the other parent is albino because of another gene( gene B)
Albinism only happens if it's inherited both recessive allelles.
The male and female mouse follow those rules, so the cross between them is:
AAbb x aaBB
All their pups, the generation F1, is:AaBb
Since the disease is recessive (that means: aa), they don't have albinism.
After they cross each other: AaBb x AaBb (see the image attached)
The correct answer is (a.) a mutation of the hemoglobin allowing better oxygen-carrying capacity. The mutation of the hemoglobin that allows a better oxygen-carrying capacity would be the most beneficial to an elephant and its descendants.
How your teeth are shaped and formed
Just like humans, the dogs cells are designed, DNA caused, hereditary, ect. are programmed to break down at a certain time in life. hope this helps....