In rabbits white fur is dominant to black fur. If a white rabbit mates with a black rabbit and produces some black bunnies, what are the genotypes of the parents? Show a Punnett square to explain...

In rabbits white fur is dominant to black fur. If a white rabbit mates with a black rabbit and produces some black bunnies, what are the genotypes of the parents? Show a Punnett square to explain your answer 

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megamind-616 | Middle School Teacher | (Level 1) Associate Educator

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When completing a Punnett Square, letters are used to designate the alleles involved. The question states that white fur is dominant to black fur. Therefore, "W" will represent the dominant white allele and "w" will represent the black fur. The only genotype that will represent a black furred bunny would be "ww" (homozygous recessive). However, the homozygous dominant (WW) or heterozygous (Ww) genotypes both code for white fur. Yet, since some black bunnies are produced, the white furred bunny must be heterozygous. Thus, the following Punnett Square would be applied:

           w                  w

W       Ww               Ww

w      ww                 ww

Phenotype frequencies:

50% white

50% black

Genotype frequencies:

50% heterozygous

50% homozygous recessive 

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