Question

Piebald spotting is a condition found in humans in which there are patches of skin that lack pigmentation. The condition results from the inability of pigment-producing cells to migrate properly during development. Two adults with piebald spotting have one child who has this trait and a second child with normal skin pigmentation. Is piebald spotting dominant or recessive

Answer 1

Answer:

The correct answer is dominant.

Explanation:

On the basis of the given question, both the parents are suffering from piebald spotting, that is, a condition in which patches of the skin is devoid of pigmentation. It is given that one of the progenies of the parents is exhibiting normal skin, while other is exhibiting piebald spotting.  

The condition results due to the non-tendency of the cells that generate pigment to migrate appropriately at the time of development indicate that if the trait would have been recessive, then both the child should have been suffering from the condition. As this is not the case, it shows that the trait is dominant, and it also shows that the two parents are heterozygous for the trait not homozygous.