NBEO Visual Perception Practice Exam 2025 – Comprehensive Test Prep

Question: 1 / 400

Hereditary color deficiencies are more frequently observed in which gender?

Males

Hereditary color deficiencies are more frequently observed in males primarily because of the genetic mechanism involved in the inheritance of these conditions. The most common forms of color vision deficiency, such as red-green color blindness, are X-linked recessive traits. This means that the genes responsible for these deficiencies are located on the X chromosome.

Males have one X chromosome and one Y chromosome, so if they inherit an affected X chromosome, they will express the color deficiency. In contrast, females have two X chromosomes, so even if they inherit one affected X chromosome, they typically have a second, normal X chromosome that can compensate for the deficiency. As a result, females are less likely to express the trait unless they inherit two affected X chromosomes, which is much rarer.

This genetic predisposition explains why hereditary color deficiencies are significantly more prevalent in males compared to females.

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Females

Both genders equally

None of the above

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