Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 23, Problem 14TYK
Cystic fibrosis is a very serious genetic disorder that occurs in homozygotes for a recessive allele. Although the disease is extremely serious, this recessive allele appears with surprisingly high frequency in Caucasian populations. It has been suggested that siblings of individuals with cystic fibrosis may have some protection from certain bacterial infections of the gut. If this is true, then the recessive allele is maintained at high frequency by
- a. the founder effect.
- b. new mutations.
- c. heterozygote advantage.
- d. frequency-dependent selection.
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Students have asked these similar questions
If, within specific regional populations over two thousand years ago, sickle-cell anemia killed those individuals born with it before they could reproduce to pass it on to offspring, how did it persist in these populations?
Group of answer choices
A-Because of late-onset of the disease.
B-Because it is cause by a virus and it spreads faster than people died.
C-Because of the basic principles of mendelian inheritance that result in some heterozygote "carrier" combinations.
D-Because malaria made it possible to survive sickle cell anemia since the parasite would carry oxygen on the blood cells with the mutated hemoglobin.
E-It does not persist. Natural selection removes the allele because people die from both malaria and sickle-cell anemia.
Are the following examples a description of genetics at the molecular, cellular, organismal, or populational level?
A. People with cystic fibrosis have lung problems due to a buildup of mucus in their lungs
B. The mutant CF gene encodes a chloride transporter that doesn't
transport chloride ions very well.
C. A defect in the chloride transporter causes a salt imbalance in lung cells.
You are investigating a newly emerging bacteriophage infecting your bacteria. There is a population of bacteria that are resistant to the disease. The allele frequency of the resistant allele is q=0.43. The mutation rate (Aàa) of the locus is 3.2 x 10-2. Assuming no back mutations, how do you expect the allele frequency of the recessive allele to change in the next generation?
a.
It will decrease a little
b.
It will not change
c.
It will decrease a lot
d.
It will increase a little
e.
It will increase a lot
Chapter 23 Solutions
Study Guide for Campbell Biology
Ch. 23 - a. What is a major source of genetic variation for...Ch. 23 - In a population of 200 mice, 98 are homozygous...Ch. 23 - Use the allele frequencies you determined in...Ch. 23 - Practice using the Hardy-Weinberg equation so that...Ch. 23 - Prob. 5IQCh. 23 - Why hasnt the highly deleterious sickle-cell...Ch. 23 - a. What is Hardy-Weinberg equilibrium? b. Define...Ch. 23 - Prob. 2SYKCh. 23 - Prob. 1TYKCh. 23 - Prob. 2TYK
Ch. 23 - Prob. 3TYKCh. 23 - Prob. 4TYKCh. 23 - Mice have an estimated 1,000 olfactory receptor...Ch. 23 - Prob. 6TYKCh. 23 - If a population has the following genotype...Ch. 23 - In a population with two alleles, B and b, the...Ch. 23 - Prob. 9TYKCh. 23 - Prob. 10TYKCh. 23 - In a random sample of a population of shorthorn...Ch. 23 - Genetic drift is likely to be seen in a population...Ch. 23 - Porphyria variegata is a genetic disease...Ch. 23 - Cystic fibrosis is a very serious genetic disorder...Ch. 23 - Prob. 15TYKCh. 23 - Prob. 16TYKCh. 23 - Prob. 17TYKCh. 23 - Prob. 18TYKCh. 23 - Prob. 19TYKCh. 23 - Prob. 20TYKCh. 23 - Prob. 21TYK
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