Question

71. Which of the following statements best explains why sheep X has black wool? Black wool is a recessive trait, and sheep X is heterozygous for wool color. Black wool is a dominant trait, and sheep X is homozygous dominant for wool color. Black wool is a dominant trait, and sheep X is heterozygous for wool color. Black wool is a recessive trait, and sheep X is homozygous recessive for wool color

Answer 1

Ans :

71) Option 1

Black wool is a recessive trait, and sheep X is heterozygous for wool color.

Reason : The Black sheep are quite rare, as black wool is caused by recessive gene. There is only possibility of 25% or less than that the offspring would be a black one. If a white ram(male sheep) and a white ewe(female sheep) are each heterozygous for black, the possibility is 3 : 1.

Ww X Ww

F1 generation    WW Ww Ww ww   

   3 white & 1 black