Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 10.4, Problem 1TC
Summary Introduction
To determine: Whether the risk of skin cancer have selected against pale-skinned people in equatorial regions.
Introduction: Natural selection denotes the process of evolution where organisms possessing favorable traits become more successful than other organisms. These traits are also passed on to the successive generation by the process of sexual reproduction.
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Students have asked these similar questions
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
What is the possible explanation for why so many Europeans have lighter skin?
How is the diversity in human skin color related to human environmental adaptation?
Chapter 10 Solutions
Biology
Ch. 10.1 - Prob. 1CSCCh. 10.1 - Prob. 1CYLCh. 10.1 - Prob. 2CYLCh. 10.1 - Prob. 3CYLCh. 10.2 - What would be the consequences for the resulting...Ch. 10.2 - What would be the genetic consequences for the...Ch. 10.2 - Prob. 1CSCCh. 10.2 - describe the steps and outcome of meiotic cell...Ch. 10.2 - Prob. 2CYLCh. 10.3 - explain how meiosis and sexual reproduction...
Ch. 10.4 - Prob. 1HYEWCh. 10.4 - Prob. 1CYLCh. 10.4 - describe some of the human genetic disorders that...Ch. 10.4 - Prob. 1TCCh. 10 - Prob. 1MCCh. 10 - Prob. 2MCCh. 10 - Prob. 3MCCh. 10 - Prob. 4MCCh. 10 - Prob. 5MCCh. 10 - Meiotic cell division produces ________ (how many)...Ch. 10 - During ___________ of meiosis 1, paired homologous...Ch. 10 - Prob. 3FIBCh. 10 - Prob. 4FIBCh. 10 - Prob. 5FIBCh. 10 - Prob. 1RQCh. 10 - Prob. 2RQCh. 10 - Prob. 3RQCh. 10 - Describe how meiosis provides for genetic...Ch. 10 - Define nondisjunction, and describe common...Ch. 10 - Many plants car. reproduce sexually or asexually....
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- So if skin color selection is not related to cancer, what accounts for the difference in skin color of different human populations? Meaning where is the selective pressure coming from to explain the differences in skin color?arrow_forwardUltraviolet rays in sunlight cause skin cancer. In today’s world, people of all skin colors, but especially paleskinned people, are often urged to stay out of the sun and get their vitamin D from food or supplements. In the past, do you think that the risk of skin cancer selected against pale-skinned people, partially counterbalancing selection in favor of pale skin for vitamin D production?arrow_forwardWhy is skin cancer an unlikely trigger for the evolution of darker skin color? Be sure to fully explain your answer.arrow_forward
- 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…arrow_forwardAccording to Nina jablonski's research dark skin is adaptive because it protects from __________ at low latitudes. Light skin is a derived trait at high latitudes to allow for __________ production.arrow_forwardBased on everything that you have learned so far, provide an explanation for how the different shades of skin color from pinkish white to dark brown evolved throughout human history.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_forwardAn experiment has been initiated in a laboratory where recombinant DNA technology has been used to substitute the gene responsible for change of colour in chameleon with another gene responsible for “glowin-the-dark”. If this experiment is successful, chameleons carrying the “glow-in-the-dark” gene will not be able to change their colours any longer. Discuss the implication of these results in terms of ethics and conservation biology.arrow_forwardImagine the following: A disorder that leads to nearsightedness (difficulty seeing things at a distance) is caused by a genetic mutation. On a small island in the pacific, nearsightedness was particularly harmful to people living there because they relied on sight to interpret their surroundings. In the 1600s, a huge storm killed many of the people on this island. Before the storm, 0.1% of the people had this mutation impacting their vision. Of the 50 people who survived the storm, 2% were nearsighted. Within a few generations, 10% of the islanders were nearsighted. Which is the likely evolutionary force behind this observation? Have the student to explain the reasonarrow_forward
- Which evolutionary force is likely responsible for the increased incidence of xeroderma pigmentosum (extreme sun sensitivity) in some Navajo peoples and describe how it came about.arrow_forwardWhich factors were determined to directly cause the loss of skin pigmentation in humans as a result of natural selection? the impact of UV radiation on folate and Vitamin D levels in human populations the clothing worn by humans in the early 8th century the interaction of human populations with predators in colder climates a change in the diet of human populations as they settled in colder climatesarrow_forwardWhy is it that the evolution of skin color is considered a case of natural selection? Group of answer choices A- Because different alleles in skin color genes lead to differences in skin color B- Because differences in skin color lead to differences in number of children in different environments C- Both D- Neitherarrow_forward
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