Question

in the total absence of melanin production, a person would_.
a have dark skin tone.
b have medium skin tone.
c have light skin tone.
d have albinism.
e have very dark skin tone.
question 8
variations in skin tone correlate with:
a exposure to sunlight.
b folate stores in the body.
c vitamin d production.
d melanin expression.
e all of these.

Explanation:

• First question: Albinism is a genetic disorder characterized by the complete or partial absence of melanin production. So, in the total absence of melanin production, a person would have albinism. Skin tone (light, medium, dark) is related to the amount of melanin present (not total absence).
• Second question:
• Sunlight exposure affects melanin production (more sunlight can stimulate more melanin in some cases).
• Folate can be broken down by UV rays (from sunlight), and melanin helps protect folate stores.
• Vitamin D is produced when sunlight interacts with the skin, and melanin levels can influence the rate of vitamin D production (more melanin can slow it down as it acts as a filter to some extent).
• Melanin expression directly affects skin color. So variations in skin tone correlate with all these factors.

Answer:

• First question: D. have albinism.
• Second question: E. All of these.