Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 10.5, Problem 1CSR
Summary Introduction
To describe:
Whether the risk of skin cancer is selected against pale-skinned to balance selection in favor of pale skin for production of vitamin D.
Introduction:
Cancer can be defined as a group of diseases which are characterized by abnormal growth of cells. These cells have the ability to invade and spread to other tissues present in the body. Skin cancer is one of the most common types of cancer.
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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?
a.)What effect does directional selection have on genetic variation?
b.)A population has an allele that encodes for ear size, large ear being dominant and small ear being recessive. The frequency of the dominant allele is .6. What percentage of the population has big ears?
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.
Chapter 10 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 10.1 - The Rainbow Connection The genetic variability or...Ch. 10.1 - Prob. 1CYLCh. 10.1 - Prob. 2CYLCh. 10.1 - Prob. 3CYLCh. 10.2 - The Rainbow Connection As Tess and Chris Giddings...Ch. 10.2 - describe the steps and outcome of meiotic cell...Ch. 10.2 - Prob. 1HYEWCh. 10.2 - What would be the consequences for the resulting...Ch. 10.2 - Prob. 2CYLCh. 10.2 - What would be the genetic consequences for the...
Ch. 10.2 - Prob. 3TCCh. 10.3 - explain how meiosis and sexual reproduction...Ch. 10.4 - compare and contrast the three main types of...Ch. 10.5 - Prob. 1CSRCh. 10.5 - Prob. 1CTCh. 10.5 - Prob. 1CYLCh. 10.5 - describe some of the human genetic disorders that...Ch. 10 - Many plants car. reproduce sexually or asexually....Ch. 10 - Meiotic cell division produces ________ (how many)...Ch. 10 - Pairs of chromosomes with almost identical genetic...Ch. 10 - Prob. 1RQCh. 10 - Prob. 2FIBCh. 10 - Prob. 2MCCh. 10 - Prob. 2RQCh. 10 - Prob. 3FIBCh. 10 - Prob. 3MCCh. 10 - Prob. 3RQCh. 10 - Prob. 4FIBCh. 10 - Prob. 4MCCh. 10 - Diagram and describe the three main types of...Ch. 10 - Prob. 5FIBCh. 10 - Prob. 5MCCh. 10 - Describe how meiosis provides for genetic...Ch. 10 - Define nondisjunction, and describe common...
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- Natural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal in the homozygous condition ever be completely removed from a large population by natural selection?arrow_forwardAccording to the video “The Biology of Skin Color”, why is it that the allele coding for darker skin did not evolve to protect us from skin cancer? A. Because skin cancer isn't harmful B. Darker skin did develop to protect us from skin cancer C. Because skin cancer usually develops after an individual's reproductive years, so it doesn't affect the ability for someone to pass on their genes D. Because skin cancer usually develops before an individual's reproductive years, so it doesn't affect the ability for someone to pass on their genesarrow_forwardA family of mice living in a small cage had babies with white fur coloring and brown fur coloring. The parents of these babies are both brown in color, but each of the parents had a parent with white fur color. How did the babies with white fur get their fur coloring?arrow_forward
- Which of the following decreases the evolutionary fitness in people with darker skin color? Assume there is no dietary supplementation. A_ Low folate in areas with high UV B_ Low folate in areas with low UV C_Low vitamin D in areas with high UV D_Low vitamin D in areas with low UVarrow_forwardA meadow is home to a population of plants of a particular species. Among these individuals are 125 plants that have red flowers and 375 plants that have white flowers. The allele of the flower color gene that produces red flowers (R) is completely dominant over the white flower color allele (r). Which statement about this population of plants is true? a- 75% of the flower color alleles are the R allele. b- 13% of the flower color alleles are the R allele. c- 25% of the flower color alleles are the R allele. d- 87% of the flower color alleles are the R allele.arrow_forwardThe English peppered moth has two main colour variations, white and black. Black soot from pollution helped black moths camouflage and blend in with their surroundings. In the 1950s, the populations of white moths began to increase. What can you conclude? Question 3 options: Air pollution decreased Air pollution increased Black moths were forced to adapt and change white to avoid being eaten The white moths developed another mutation that prevented them from finding mates The air pollution killed the birds that ate the mothsarrow_forward
- In Genetic Variation, If people have a similar genetic makeup, why do weu use DNA to understand or determine whether suspects are innocent or guilty of a crime.arrow_forwardIn a large population, dairy cows were selected for high milk production. What do you expect to happen with the genes affecting milk production? Do you expect to see a higher or lower variability of alleles after several years of selection?arrow_forwardDog breeds are an example of artificial selection, which means ______ selected for certain traits in dogs fill the balnkarrow_forward
- fill the blanks. In humans, having freckles is dominant to not having freckles. What are the possible genotypes with someone with freckles? [blank1], [blank2]arrow_forwardSelection may also act against heterozygotes. How do allele frequencies change if the two homozygotes have equal fitness, but heterozgotes have a 50% reduced fitness? Explain what happens and whyarrow_forwardThis type of selection favors individuals with alleles at both end of the spectrum of Traitsarrow_forward
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