Why do researchers believe color deficiencies often have genetic causes?
A) Dietary patterns affect color deficiencies.
B) Color perception changes somewhat as we get older.
C) Color deficiencies are more common in some cultures.
D) More males than females suffer from color deficiencies.

Question

Quizplus · Accepted Answer

Color deficiencies often have genetic causes, as evidenced by the fact that they are more prevalent in males than females. This is due to the fact that the genes responsible for the most common forms of color vision deficiency are located on the X chromosome. Since males have only one X chromosome (XY), a single defective gene on their X chromosome will result in color deficiency. Females, having two X chromosomes (XX), are less likely to be affected because a defective gene on one X chromosome can often be compensated for by a normal gene on the other X chromosome.

Why Do Researchers Believe Color Deficiencies Often Have Genetic Causes