In some goats, white hair is dominant and black hair is recessive. which of the following statements is true? color in goats is a sex-linked trait. a gray goat (ww) expresses incomplete dominance. a black goat (ww) expresses codominance. a gray goat (ww) must have a mutated gene.

A gray goat (Ww) expresses incomplete dominance.

If Mendel were given black mouse & a white mouse & asked what their offspring would look like, he would've said that a certain percent would be black & the others would be white. He would never have even considered that a white mouse & a black mouse could produce a GREY mouse! For Mendel, the phenotype of the offspring from parents with different phenotypes always resembled the phenotype of at least one of the parents. In other words, Mendel was unaware of the phenomenon of INCOMPLETE DOMINANCE.

I remember Incomplete Dominance in the form of an example like so:
RED Flower x WHITE Flower ---> PINK Flower

A grey goat (Ww) expresses incomplete dominance.

Just because white is dominant it doesn't mean that all the offspring will be white. Some might be white, other black and some grey.

Hope it helped!