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WorksheetsBiology of Skin Color
Total questions: 20
Worksheet time: 21mins
What does this image represent?
weather conditions
amount of ultraviolet light intensity
skin color
altitude
Traveling away from the equator, what happens in general to the amount of UV intensity?
The intensity decreases.
The intensity increases
The intensity stays the same.
It is impossible to predict.
Who would be most at risk of developing rickets, a bone disease caused by insufficient calcium absorption?
Children born to mothers with dark skin living far from the equator.
Adults with dark skin who live close to the equator.
Children born to mothers with light skin, living close to the equator.
Adults with light skin who live close to the equator.
Anyone who eats a diet that includes a lot of fish
How does melanin protect cell's DNA from the damaging effects of Ultraviolet light?
It relies on folate
It doesn't you must use sunscreen
it activates vitamin D3 production which takes care of that
Forms a protective cap over the nucleus of skin cells
What does sunlight (UV exposure) do to folate in our body?
breaks it down
builds it up
creates it
makes it stronger
Folate is:
a B-Vitamin
used to make DNA and other genetic material
important for pregnancy
all of the above
What do you predict would happen to the frequency of the genes that cause more of the molecules to be made in a population over time?
It would increase
It would increase because individuals with the genes pass it to offspring.
It would decrease because they don't need those genes.
It would stay the same.
Which answer is more appropriate?
Traits are good or bad.
Traits can be harmful or hurtful depending on the environment.
Traits are always helpful or hurtful, regardless of the environment.
Traits are helpful or bad.
The graph in Figure 2 summarizes the age at which people are diagnosed with melanoma, the most serious form of skin cancer. Why does protection from skin cancer not explain the strong selective pressure for dark skin in high UV ares.
Because the median age is 63.
Because most people get skin cancer at a young age.
Because most people get skin color at an old age.
Because many people get skin color at an older age after they have already had children and probably passed the gene onto them.
