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 10TYK
Summary Introduction
Introduction: In 1908, G. H. Hardy and Wilhelm Weinberg evaluated the basic principle of population genetics. At equilibrium, the
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A population of mice contains 20 animals Show work here: with white tails and 30 animals with grey tails. Grey tails are the dominant trait.
a. What is the frequency of the white allele?
b. What is the frequency of the grey allele?
c. What is the frequency of heterozygotes?
d. What is the frequency of mice homozygous for the grey allele?
We observe disruptive selection when the extreme values of a trait such as light and dark coat colors are selected for instead of a medium coat color? A. true
b. False
There is a population of cats and 16% of the cats this population show a recessive trait.
a. What is the frequency of the recessive allele?
b. What is the frequency of the dominant genotype?
c. What is the frequency of cats with the heterozygous genotype?
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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- Assume you are studying a population of hummingbirds. The population has an average beak length of 20 millimeters, but a drought removes one type of flower that only long-beaked hummingbirds survive. The surviving population has an average beak length of 28 millimeters. You know that the heritability is 0.25. What is the predicted response to selection? a. 8 millimeters b. 0 millimeters c. 2 millimeters d. 4 millimetersarrow_forwardIn a population of 1000 mice, the allele frequency for dominant brown fur is 0.25. The population is in Hardy-Weinberg equilibrium. How many individuals will be heterozygous in the population? A. 375 B. 625 C. 750 D. 500arrow_forwardIn horses, tobiano is a white spotting pattern. The tobiano allele (T) is dominant over the non-tobiano (t) allele. In an ideal horse population exhibiting Hardy–Weinberg equilibrium, 350 horses out of 465 are non-tobiano. a. Calculate the number of homozygous dominant tobiano horses. Answer b. Calculate the number of heterozygous horses. Answer c. Calculate the number of tobiano horses in the population. Answer Express your answer rounded to the nearest whole number.arrow_forward
- In achondroplastic dwarfism, an autosomal dominant disease, the gene is lethal in homozygotes. If the frequency of the normal allele is 0.99, what is the heterozygote frequency? a. 0.01 b. 0.02 c. 0.98 d. 0.99 An autosomal recessive gene is lethal in homozygotes. In a population at Hardy- Weinberg equilibrium, how many generations will it take to eliminate the gene from the population a.100 b.It will not be eliminated from the population. c.1 d.25arrow_forwardSuppose a population of 1000 people is in H-W equilibrium, if 84% of this population can taste PTC, how many are heterozygotes, considering that ability to taste PTC is inherited as a dominant allele?A. 480B. 400C. 580arrow_forwardA gene exists in two alleles designated D and d. If 48 copies of this gene are the D allele and 152 are the d allele, what is the allele frequency of D? a. 0.24 c. 0.38 b. 0.32 d. 0.76arrow_forward
- What is the percentage of people with light eyes in the population were the concentration of the allele which determines the dark eye color is 0,6? Select one: a. 16 % b. 24 % c. 36 % d. 48 % e. 84 %arrow_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). Approximately what percent of the plants in the meadow would be expected to have the Rr genotype? Group of answer choices a. 23% b. 33% c. 2% d. 76%arrow_forwardYou are surveying population genetics of snails while studying abroad in New Zealand. At your locus of interest, you have AA: 32 Aa:46 aa: 22. Identify the statement that accurately describes this population. a. The genotype frequency of AA is 0.77. b. The frequency of the A allele is 0.45. c. The genotype frequency of the heterozygotes is 0.45. d. The frequency of the a allele is 0.23.arrow_forward
- You get a job with the Texas Dept. of Agriculture. One day you are called to a cattle ranch that is infested with fire ants and there are hundreds of nest openings per acre. You examine the nests and find 200-300 queens per nest. Based on this information, which can you correctly conclude? a. The population of fire ants on the ranch consists of monogyne colonies that contain queens which are BB at the Gp9 locus. b. The population of fire ants consists of polygyne colonies in which both the workers and the queens are Bb at the Gp9 locus c. The workers are BB at the Gp9 locus, but the queens are Bb. d. The workers are bb at the Gp9 locus, but he queens are BB.arrow_forwardIssues with inbreeding often occurs with dog breeds, such as German shepherds. How can we the best describe inbreeding? a. successive breeding with individuals from a variety of populations b. successive breeding within individuals from within one population c. breeding between different breeds to produce new breeds d. breeding the same set parents more than oncearrow_forwardSuppose a population of mice is subject to a few years of very cold, dry winters that drastically decreases their numbers. After the decrease in population size, there was a population of 200 mice, with 182 showing the dominant long tail phenotype and 18 showing the recessive short tail phenotype. a. What is the frequency of the recessive allele? b. What is the frequency of the dominant allele?arrow_forward
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