According to the video “The Biology of Skin Color”, why are UV rays dangerous to our bodies? What can they do? A. UV rays can mutate the DNA in our skin cells B. UV rays can cause skin cancer C. UV rays can destroy folate D. All of the above
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According to the video “The Biology of Skin Color”, why are UV rays dangerous to our bodies? What can they do?
A. UV rays can mutate the DNA in our skin cells
B. UV rays can cause skin cancer
C. UV rays can destroy folate
D. All of the above
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- According to the video “The Biology of Skin Color”, how does UV exposure vary throughout the world? A. The UV rays are the same at the equator and the earth's poles B. There are higher UV rays near the equator and lower UV rays towards the north and south poles C. UV rays don't vary across the globe D. There are lower UV rays near the equator and higher UV rays towards the north and south polesAccording to the video “The Biology of Skin Color”, why is UVB critical for humans? A. It helps our bodies break down Vitamin D, which can be toxic to our bodies. B. It helps our bodies synthesize Vitamin C, which we need in order to absorb calcium in our diet. C. UVB is not critical or useful for us. D. It helps our bodies synthesize Vitamin D, which we need in order to absorb calcium in our diet.According to the video “The Biology of Skin Color”, how does skin color throughout the world match up with UV exposure? A. Lighter skin is usually found in high UV areas while darker skin is usually found in low UV areas B. Skin color throughout the world does not match up with UV exposure C. Darker skin is usually found in high UV areas while lighter skin is usually found in low UV areas D. UV rays are the same throughout the world, so there is no pattern or correlation with skin color
- How does skin color throughout the world match up with UV exposure? A. Darker skin is usually found in high UV areas while lighter skin is usually found in low UV areas B. UV rays are the same throughout the world, so there is no pattern or correlation with skin color C. Skin color throughout the world does not match up with UV exposure D. Lighter skin is usually found in high UV areas while darker skin is usually found in low UV areasAccording to the video “The Biology of Skin Color”, why do humans need calcium? A. To build strong and large brains. B. To build strong bones and have a healthy immune system. C. To help us digest dairy. D. Humans don't need calcium.According to the video “The Biology of Skin Color”, why is lighter skin needed in areas closer to the north and south poles where UV rays are weaker? A. Individuals with a lot of melanin would get too much UV ray penetration in their skin and they wouldn't be able to synthesize vitamin D. B. Lighter skin is not necessary in the north and south poles. C. Individuals with a lot of melanin wouldn't get enough UV ray penetration in their skin to synthesize vitamin B. D. Individuals with a lot of melanin wouldn't get enough UV ray penetration in their skin to synthesize vitamin D.
- Can the effects of UV light on the folate explain the full variation of human skin color that exists among human populations today? Expain your reasoning.Human populations living in countries in the northern latitudes, such as Finland, have a lighter complexion than people living in the tropical countries. What do you think is the reason for this difference?You will now look at another figure that has to do with skin color. One way to measure skin color is by skin reflectance. Scientists can shine visible light on a portion of skin (typically the inside of the arm) and then measure how much light is reflected back. Dark skin reflects less visible light than does light skin. The lower the reflectance value, therefore, the darker the skin. Figure 2. Relationship between Skin Reflectance and Latitude. This figure shows how skin reflectance changes with latitude. Negative latitudes are south of the equator (located at 0°), and positive latitudes are north of the equator. Available reflectance data from multiple sources were combined to form this graph. All combined data were obtained using a reflectometer with an output of 680 nanometers (i.e., a wavelength of visible light) and placed on the subjects’ upper or lower inner arms. (Source: Panel B of Figure 2 in Barsh(2003). Graph originally captioned as “Summary of 102 skin reflectance…
- This ABC video follows the story of a pair of fraternal African-American twins, one of whom is albino.Watch this video (http://openstaxcollege.org/l/albino) to learn about the challenges these children and their family face. Which ethnicities do you think are exempt from the possibility of albinism?Why is it really uncommon to have brown eyes with red hair?Two brown eyed parents have a child with blue eyes. Explain how this happened
