Variations In Human Skin Color

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    10.  Historically, people with darker pigmented skin live with 20 degrees of the _______________________ .

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Variations In Human Skin Color - Quiz

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  • 2. 

    15.  DNA research has shown that genetically all humans, regardless of skin color and other surface distinctions, are basically the __________________ .

    Explanation
    DNA research has demonstrated that all humans, regardless of their outward appearances such as skin color and other surface distinctions, share the same genetic makeup. This means that at a fundamental level, humans are essentially identical in terms of their genetic composition.

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  • 3. 

    5. Skin color a good way to classify people, because people respond to their __________________ adaptions. 

    Explanation
    Skin color is a good way to classify people because it is a response to their environmental adaptations. The environment plays a significant role in shaping human characteristics, including skin color. People living in different environments have adapted to their surroundings over generations, resulting in variations in skin color. For example, individuals living in regions with high sun exposure have darker skin to protect against harmful UV rays, while those in regions with less sun exposure have lighter skin to absorb more sunlight and produce vitamin D. Therefore, skin color is an important indicator of the environmental adaptations that individuals have developed.

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  • 4. 

    7.  ________________________ serves as a shield for UV exposure. 

    Explanation
    Melanin serves as a shield for UV exposure. It is a pigment produced by cells called melanocytes in the skin. When the skin is exposed to UV radiation from the sun, melanocytes produce more melanin to protect the skin. Melanin absorbs UV radiation and prevents it from damaging the DNA in skin cells, reducing the risk of sunburn and skin cancer. The more melanin present in the skin, the darker the skin color, as melanin also determines skin pigmentation.

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  • 5. 

    13.  Eskimos in Alaska  have dark skin, beacuse their traditional _______________ is rich in fish and other seafood, which are high in vitamin D.

    Explanation
    Eskimos in Alaska have dark skin because their traditional diet is rich in fish and other seafood, which are high in vitamin D. Vitamin D is produced in the skin when exposed to sunlight, but in regions with limited sunlight, such as Alaska, people rely on dietary sources of vitamin D. The dark skin of Eskimos helps protect them from the harmful effects of the sun's ultraviolet rays while still allowing them to absorb enough sunlight to produce vitamin D.

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  • 6. 

    Resource #3 11.  Jablonski and Chaplin concluded that modern humans most likely evolved in the __________________, where they were exposed to high UV levels.

    Explanation
    Jablonski and Chaplin concluded that modern humans most likely evolved in the tropics, where they were exposed to high UV levels.

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  • 7. 

    2. Besides genetics, what other factors can affect a person’s appearance and growth?

    • Exposure to ultraviolet rays (UV) can darken or tan a person’s skin.

    • Exposure to ultraviolet rays (UV) can alter genetic characteristics.

    • Varying UV causes no impact.

    Correct Answer
    A. Exposure to ultraviolet rays (UV) can darken or tan a person’s skin.
    Explanation
    Exposure to ultraviolet rays (UV) can darken or tan a person's skin because UV rays stimulate the production of melanin, the pigment responsible for skin color. When the skin is exposed to UV rays, the body produces more melanin to protect the skin from further damage. This increase in melanin production leads to a darker skin tone or tan. Therefore, UV exposure is a factor that can affect a person's appearance by changing their skin color.

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  • 8. 

    4. How has racial classification been used in North America? Choose three.

    • They represent cultural differences in our society.

    • They have been used to assign undisclosed information.

    • They have been used to enlighten people's awareness.

    Correct Answer
    A. They represent cultural differences in our society.
    Explanation
    Racial classification has been used in North America to represent cultural differences in our society. This means that race has been used as a way to categorize and differentiate people based on their cultural backgrounds and heritage. It has been used as a means to understand and acknowledge the diversity and variety of cultures present in North America.

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  • 9. 

    14.  Are dark-skinned people at an advantage or disadvantage in northern latitudes?

    • Advantage

    • Disadvantage

    Correct Answer
    A. Disadvantage
    Explanation
    Dark-skinned people are at a disadvantage in northern latitudes because their skin produces more melanin, which protects against harmful UV radiation from the sun. However, in northern latitudes where sunlight is limited, their skin may not receive enough sunlight to produce sufficient vitamin D. This can lead to a deficiency in vitamin D, which is essential for overall health and can result in various health issues such as weakened immune system, bone problems, and increased risk of certain diseases.

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  • 10. 

    8. Besides melanoma, what other conditions does melanin shield against?

    • Helps the eyes filter light.

    • Helps the body clean bacterial impurities.

    • Helps the body maintain healthy folic-acid levels.

    Correct Answer
    A. Helps the body maintain healthy folic-acid levels.
    Explanation
    Melanin is a pigment that provides color to the skin, hair, and eyes. It acts as a natural sunscreen, protecting the skin from harmful UV radiation and reducing the risk of skin cancer like melanoma. In addition to this, melanin also helps the body maintain healthy folic-acid levels. Folic acid is a B-vitamin that is essential for the production and maintenance of new cells, including those of the skin, hair, and nails. Melanin helps to regulate the levels of folic acid in the body, ensuring its proper functioning and overall health.

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  • 11. 

    12. In what way do Jablonski and Chaplin see skin color as “a balancing act”? Check two.

    • Between dietary nutritional needs.

    • Between the evolutionary demands of photo-protection

    • Between the need to create vitamin D in the skin.

    • Between the evolutionary demands of hunter gatherers.

    Correct Answer(s)
    A. Between the evolutionary demands of photo-protection
    A. Between the need to create vitamin D in the skin.
    Explanation
    Jablonski and Chaplin see skin color as a "balancing act" between the evolutionary demands of photo-protection and the need to create vitamin D in the skin. This suggests that the evolution of different skin colors in different populations is a result of finding a balance between these two factors.

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  • 12. 

    3. Why do sub-Saharan Africans have the same dark skin color as many people in places like southern Asia and Australia? Pick two.

    • Environmental factors

    • Genetics

    • Apparel opportunities

    Correct Answer(s)
    A. Environmental factors
    A. Genetics
    Explanation
    The dark skin color seen in sub-Saharan Africans, as well as in people from southern Asia and Australia, can be attributed to both environmental factors and genetics. Environmental factors such as high levels of sunlight exposure in these regions have led to the development of darker skin as a natural protective mechanism against harmful UV radiation. Additionally, genetics play a role as certain genes determine the production of melanin, the pigment responsible for skin color. Therefore, the combination of environmental factors and genetics explains why these populations share the same dark skin color.

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  • 13. 

    Resource #2 6. How does melanin determine skin color? Check three.

    • Pheomelanin, which is red to yellow in color and is produced by those with light complexions

    • Eumelanin, which is dark to black in color and is produced by those with dark-colored skin.

    • Melanin causes increased radioactivity.

    • People also differ in the number and size of their melanin particles.

    Correct Answer(s)
    A. Pheomelanin, which is red to yellow in color and is produced by those with light complexions
    A. Eumelanin, which is dark to black in color and is produced by those with dark-colored skin.
    A. People also differ in the number and size of their melanin particles.
    Explanation
    Melanin determines skin color by producing two types of pigments: pheomelanin and eumelanin. Pheomelanin is red to yellow in color and is produced by those with light complexions, while eumelanin is dark to black in color and is produced by those with dark-colored skin. Additionally, people also differ in the number and size of their melanin particles, which can further influence their skin color.

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  • 14. 

    Resource #1 1. What are some traits that people share? Check three.

    • Environmental factors like sunlight, temperature and food supply.

    • Males and females have similar sexual characteristics with others of their gender.

    • Relatives share similarities in appearance due to their common genetic make up.

    • People with ancestors from the same regions of the world often share similar physical characteristics like skin, hair color, facial characteristics, body shape, and stature.

    Correct Answer(s)
    A. Males and females have similar sexual characteristics with others of their gender.
    A. Relatives share similarities in appearance due to their common genetic make up.
    A. People with ancestors from the same regions of the world often share similar physical characteristics like skin, hair color, facial characteristics, body shape, and stature.
    Explanation
    The traits that people share are: males and females have similar sexual characteristics with others of their gender, relatives share similarities in appearance due to their common genetic makeup, and people with ancestors from the same regions of the world often share similar physical characteristics like skin, hair color, facial characteristics, body shape, and stature.

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  • 15. 

    16.  Our and many other societies have developed elaborate systems of ________________ and _______________ based on perceived racial differences. 

    • Privilage

    • Respect

    • Control

    • Education

    Correct Answer(s)
    A. Privilage
    A. Control
    Explanation
    Many societies have developed complex systems of privilege and control based on perceived racial differences. Privilege refers to the advantages and benefits that certain racial groups enjoy, often at the expense of others. Control, on the other hand, refers to the power and authority exerted by dominant racial groups to maintain their position of advantage and suppress the rights and opportunities of marginalized racial groups. These systems perpetuate inequality and discrimination, shaping social structures and interactions within societies.

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  • 16. 

    9. Some shortwave ultraviolet radiation (UVB) exposure important.  What does vitamin D do to assist the body? Choose three.

    • Helps in converting oxygen to blood cells.

    • Helps the body absorb calcium.

    • Helps the body absorb phosphorus.

    • Helps in bone growth and repair.

    Correct Answer(s)
    A. Helps the body absorb calcium.
    A. Helps the body absorb phosphorus.
    A. Helps in bone growth and repair.
    Explanation
    Vitamin D helps the body absorb calcium and phosphorus, which are essential for maintaining strong and healthy bones. It also plays a role in bone growth and repair.

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  • Mar 14, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 01, 2011
    Quiz Created by
    Marshallje
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