In rabbits,black coat is dominant to white coat.A testcross was performed between black rabbits and white rabbits.In the litter of kits (baby rabbits)that resulted 10 were black and 2 were white.What is the genotype of the black rabbit parent?
A) homozygous dominant
B) heterozygous
C) homozygous recessive
D) none of these are the parental genotype of the black rabbit
E) impossible to determine the genotype based on the information provided

Question

Quizplus · Accepted Answer

If the black rabbit parent is homozygous dominant (BB), all the offspring would be black. If the black rabbit parent is homozygous recessive (bb), all the offspring would be white. Therefore, the black rabbit parent must be heterozygous (Bb) because it can pass on either a B or a b allele. The 10 black offspring could be BB or Bb, and the 2 white offspring must be bb from the white rabbit parent.

In Rabbits,black Coat Is Dominant to White Coat