A relative complains of not being able to see very well at night when driving. She has also had dry skin and several colds over the last year. Which of the following vitamins is your relative most likely deficient in?

VITAMIN A

Explanation: Vitamin A is an essential vitamin needed by the body but it is needed in small amount because it cannot be synthesized by the body.

It is fat soluble and gotten from fruits and green leafy vegetables,milk,orange,cereals,cod-liver oil and eggs.

Vitamin A plays a vital role in the growth and development of the body and body tissues as well as maintaining a normal vision and a healthy skin so when vitamin A is deficient in the body,it is evidenced by poor vision especially poor night vision,and there is also damage to the skin and mucous membranes.

There is also weakening of the body defense mechanism (immunity ad inability of the body to produce blood cells(hematopoiesis)

From the question,the relative is experiencing poor night vision,dryness of the skin and frequent cold which indicates a deficiency of VITAMIN A

the areas around the equator

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.