In rabbits, the allele for black fur, b overshadows the allele for white fur, b. suppose two black parents produce one white and three black bunnies. list the four possible genotypes and their corresponding fur color for all four siblings.

Black fur (B) is given dominant, and white (b) is therefore recessive.

If there is at least one white fur among the offsprings, both black fur parents must be heterozygous, or Bb.

The possible genotypes of the offsprings are therefore those shown in a Punnett square, as follows

       B      b
B    BB   Bb
b     Bb   bb

Or, the possible genotypes are {BB, Bb and bb}  [ no distinction between Bb and bB]

Dna overload will occur