Question

why do all offspring have the same fur color?
a) they inherited different sets of genes from their parents
b) the genes were not mixed well enough
c) it was a coincidence
d) they have the same alleles for the relevant genes

Explanation:

Alleles are alternative forms of a gene. When offspring have the same alleles for genes related to fur - color, they will have the same fur - color. Different gene sets (a) would likely lead to variation, poor gene - mixing (b) is not a typical reason for identical traits, and it is not just a coincidence (c) in the context of genetics.

Answer:

d) They have the same alleles for the relevant genes