Embryology provides evidence for evolution because during their development, many organisms look similar, suggesting that very different organisms may have a common ancestor.
You already answered the question in the picture above
Answer:
Two locus
Explanation:
Let assume the gene for white (1st locus) be W i.e. ww = recessive
here, Let the alleles for the 2nd locus be B and b.
White: W_B_, W_bb
Black&White: wwB_
Black: wwbb
This is dominant epistasis. In dominant epistasis, where the dominant allele of the 1st locus (W) masks or hide the expression of the 2nd locus. When the two alleles in the 1st locus are recessive (ww), the alleles in the 2nd locus can be expressed(B and b).
I believe it is 'white fur' because living in the Tundra means it is snowing. Snow is white, so basically, the white fur is specifically for the Tundra.
I hope it helps.