Skin Color in Humans

So you think you know about skin color? Oh Yeah? Well you're wrong. Or maybe you're right. I guess we'll see. Take this quiz so we can settle this once and for all.

If you're studying any of the biological or geographical principles behind skin color, then this quiz is my gift to you. If you're not, then I suppose you'd better take it anyway and learn.

What is your age?
Under 18 Years Old
18 to 24 Years Old
25 to 30 Years Old
31 to 40 Years Old
41 to 50 Years Old
51 to 60 Years Old
Over 60 Years Old
What is your gender?
Male
Female
1. Which of these substances affect skin color?
Melanin
Hemoglobin
Carotene
All of the above
2. Higher concentrations of melanin are expressed as:
Darker skin
Lighter skin
Albinism
Skin cancer
3. Melanin is found in:
Skin, hair, and the iris of the eye
Skin
Skin and hair
4. Darker skin protects against:
Vitamin D deficiency
Ultraviolet light
Anemia
5. Which of the following could be a side effect of absorbing sunlight?
Increased Vitamin D production
Skin cancer
Destruction of B vitamin folate
All of the above
6. Where is UV light most intense?
Asia, Australia, North America
Europe, Central Asia, North America
Africa, South East Asia, Central America
South America, East Asia, Australia
7. Where would lighter skin have the most selective advantage?
India
France
England
United States
8. Why doesn't the geographical distribution of skin color correspond to the geographical distribution of UV light intensity?
Because of gene flow (migration Europeans to areas of intense UV light production)
Humans have been in Africa longer than they have been in Central and South America, allowing more time for darker skin to be selected for.
Some populations are able to compensate for low levels of Vitamin D produced by sunlight with a diet high in Vitamin D, allowing them to keep a darker skin tone.
All of the above
9. What is the function of Vitamin D?
Calcium absorption
Bone growth
Strengthening the immune system
Energy
Both a and b
10. What is a melanocyte?
Site for Vitamin D synthesis
Virus which attacks melanin
Pigment producing cell

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