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Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 14, Problem 2DAA
Summary Introduction
To determine: The country whose native people have the darkest and the lightest skin.
Introduction: Melanosomes in skin synthesize melanin pigment and account for the human skin color. Melanin pigment accounts for dark skin color. More melanin pigment provides protection against UV radiations and reflects less light. The inter-individual variation is seen in skin colors due to differences in cellular distribution of melanosomes and the amount of melanin they form.
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Can you please help me with this lab question
4. Look at the regions that receive the most-intense UV (light pink). Site a specific piece of evidence from the map that a factor other than latitude was contributing to UV intensity on this day.
5. In the film, Dr. Jablonski explains that melanin, located in the top layer of human skin, absorbs UV radiation, protecting cells from the damaging effects of UV. Genetics determines the type of melanin (i.e., brown/black eumelanin or red/brown pheomelanin) and the amount of melanin present in an individual’s cells. Based on this information, write a hypothesis for where in the world you would expect to find human populations with darker or lighter skin pigmentation (i.e., different amounts of melanin).
6. Explain how you could test this hypothesis.
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 Skin Color: Evidence for Selection
Name:
Jayden Bodisto
Make observations of the Figure below. Then complete the portion below.
Erythemal UV index
80
0
09-
KNMI/ESA
-120
0
-120
2
4
-60
6
8
10
60
Clear-sky
24 September 2015
120
10
60
12
14
120
16
-60
18
Figure 1. Ultraviolet Radiation Index Across the World. The colors on this map of the world represent
Ultraviolet (UV) Index values on a particular day in September 2015. The UV Index is a standardized scale of UV
radiation intensity running from 0 (least intense) to 18 (most intense). The y-axis values are degrees of latitude,
which range from the equator (0°) to the poles (90° north and -90° south). The x-axis values are degrees of
longitude, which range from the prime meridian (0°) to the antimeridian (180° east and -180° west). (Source:
European Space Agency, http://www.temis.nl/uvradiation/UVindex.html.)
The Driving Question: What is the relationship between UV radiation and skin color?
What do I see?
List specific things you…
Chapter 14 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 14 - Constructing a pedigree is particularly useful...Ch. 14 - Prob. 2SQCh. 14 - Prob. 3SQCh. 14 - Prob. 4SQCh. 14 - Prob. 5SQCh. 14 - A trait that is present in a male child but not in...Ch. 14 - Color blindness is a case of ______ inheritance....Ch. 14 - A female child inherits one X chromosome from her...Ch. 14 - Prob. 1DAACh. 14 - Prob. 2DAA
Ch. 14 - Prob. 3DAACh. 14 - Prob. 9SQCh. 14 - Expression of the SRY gene on the Y chromosome...Ch. 14 - Prob. 11SQCh. 14 - Prob. 12SQCh. 14 - Prob. 13SQCh. 14 - Prob. 14SQCh. 14 - Match the chromosome terms appropriately. ____...Ch. 14 - Prob. 1GPCh. 14 - Does the phenotype indicated by the red circles...Ch. 14 - Human females have two X chromosomes (XX); males...Ch. 14 - A mutated allele responsible for Marfan syndrome...Ch. 14 - The somatic cells of most individuals with Down...Ch. 14 - Mutations in the genes for clotting factor VIII...
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- Can you please help me with this lab question . Examine Figure 1 above and answer Questions 1–6. 1. Describe the relationship between the UV Index (the colored bar in Figure 1) and latitude (y-axis). 2. How do you explain the relationship between the UV Index and latitude? (In other words, why does UV intensity change with latitude?) 3. Find your approximate location on the map. What is the primary UV Index value of your state on this particular day in September? _________ 4. Look at the regions that receive the most-intense UV (light pink). Site a specific piece of evidence from the map that a factor other than latitude was contributing to UV intensity on this day. 5. In the film, Dr. Jablonski explains that melanin, located in the top layer of human skin, absorbs UV radiation, protecting cells from the damaging effects of UV. Genetics determines the type of melanin (i.e., brown/black eumelanin or red/brown pheomelanin) and the amount of melanin present in an individual’s…arrow_forwardThree Carnturus in this photo I’m asking color difference they have. Nothing more Like what color each of them have.arrow_forward600 90°N 60°N 500 30°N 0° 400 Insolation 300 (Wm²2) 200 100 J'F MA MJJA s'o'N`D Month The skin tone of a native population living at 60°N would most likely be dark to increase production of Vitamin D. dark to protect DNA and folate. light to increase production of vitamin D. light to protect DNA and folate. --March Equinox- - June Solstice- -September Equinox- || December Solstice-arrow_forward
- We know that lighter skin evolved more than once because the SLC24A5 gene is missing from some populations. Question 17 options: True Falsearrow_forwardWith references at the end,What are the advantages and disadvantages of sunscreens containing common active ingredients such as oxybenzone,octocrylene and homosalate.arrow_forwardFill in the blackarrow_forward
- Colourblidness is more frequent in males as compared to females. Comment.arrow_forwardYou 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…arrow_forwardExplain the photo clearly, please.arrow_forward
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