Why do researchers believe that deficits in color vision 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 are often linked to genetic causes, as evidenced by the fact that they occur more frequently in males than females. This is due to the fact that the most common forms of color vision deficiency are linked to the X chromosome. Since males have only one X chromosome (XY), a defect in the gene responsible for color vision on the X chromosome will result in color vision deficiency. Females, having two X chromosomes (XX), are less likely to be affected because a defect in one of the X chromosomes can be compensated for by the other, normal X chromosome.

Why Do Researchers Believe That Deficits in Color Vision Often