Biology

Biology, 13.09.2019 21:30, drewlopez

Lightly pigmented people are at lower risk of skin cancer that heavily pigmented individuals.
a. true
b. false

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Biology, 27.06.2019 19:00, alyssamonae

Darker skin is more prevalent in high-uv areas. dr. nina jablonski proposed a hypothesis to explain the selective pressure for darker skin in these environments. on what evidence did she base this hypothesis? darker skin is more prevalent in high-uv areas. dr. nina jablonski proposed a hypothesis to explain the selective pressure for darker skin in these environments. on what evidence did she base this hypothesis? the melanin in darkly pigmented skin protects circulating folate from being destroyed by uv radiation, and folate is important in human reproduction the melanin in darkly pigmented skin protects dna from uv radiation, and uv radiation can cause skin cancer people of african descent all have the same version of the mc1r gene, indicating that this gene was under selection she discovered that people of african descent have less folate circulating in their blood and that folate is important for human reproduction

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Physics, 04.07.2019 19:40, jadepotts3965

The color that we see when looking at a pigmented object is a. the wavelengths that are reflected or transmitted by the pigmented object b. the wavelengths that have been raised to an excited state by the pigmented object c. the wavelengths that are absorbed by the pigment d. the wavelengths that the pigmented object created after interacting with sunlight

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Biology, 02.10.2019 05:00, erickasmith1988

Malignant tumor of pigmented skin cells:

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Biology, 11.10.2019 08:20, foxrule

Human populations in low-uv environments tend to have more lightly pigmented skin. one explanation is that the selective pressure for dark skin decreases as uv intensity decreases. at the same time there is selection for lighter skin to absorb more uv radiation, which is needed for vitamin d production. what evidence supports the vitamin d hypothesis for the evolution of lighter skin tones?

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