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 21TYK
Summary Introduction
Introduction: The field of biology that deals with the study of the composition of genetic material within the population is called population genetics. There are certain factors that led to the process of evolution. They are natural selection, genetic drift, mutation, gene flow, migration, which all lead to changes in the genetic composition.
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A hypothetical population was found to have a genotype frequency of AA=20%, Aa=40%, aa=40%. If the “A” allele determines the larger beak depth of this species (“AA” leads to large beak depth, “Aa” is moderate beak depth, and “aa” leads to smaller beak depth), what type of selection is this trait likely experiencing in this population?
a. stabilizing
b. directional
c. disruptive
d. none of the above
Individuals in a population of sunflowers have a range of flower sizes, and the average diameter of their flowers is 5 cm. What effect would selection have on flower diameter in this population of sunflowers?
A. The average flower diameter may not change if the population is under disruptive selection.
B. Small flowers are favoured if the population is under disruptive selection.
C. The average flower diameter will increase if the population is under stabilizing selection.
D. Large flowers are favoured if the allele for flower size is dominant when the population is under directional selection.
A hypothetical population was found to have a genotype frequency of AA=25%, Aa=50%, aa=25%. If the “A” allele determines the larger beak depth of this species (“AA” leads to large beak depth, “Aa” is moderate beak depth, and “aa” leads to smaller beak depth), what type of selection is this trait likely experiencing in this population?
a. directional
b. stabilizing
c. disruptive
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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- A wildflower normally bears blue flowers. Occasionally, plants with pink flowers are observed in wild populations. Flower color is controlled at a single locus, with the pink allele completely recessive to the blue allele. In one population, 25 pink flowers and 3291 blue flowers were found. a. Calculate the expected allele frequencies and genotype frequencies if the population were in HWE. b. The mean # of pods of these plants were examined. Assume that heterozygotes are as fit as homozygous blue, and that seeds from both pink and blue all suffer about the same mortality rate after germinating. Calculate the relative fitness of each genotype. c. Predict quantitatively the effect of natural selection on the frequencies of phenotypes in the next generation. Blue: mean # of plants: 19.33 # of plants: 39 Pink: mean # of plants: 13.08 # of plants: 24arrow_forwardYou are examining the gene in your snail population that confers resistance to a parasite. There are multiple alleles at this locus. Identify the characteristics that would result in the greatest increase in allele frequency (not necessarily the greatest allele frequency) in one single generation of the resistant allele. Answer Resistant allele acts… Initial resistant allele frequency… Selection strength is… a. dominantly high weak b. recessively low strong c. dominantly low strong d. recessively high weak a. Answer a. b. Answer b. c. Answer c. d. Answer d.arrow_forwardYou are studying a genetically modified mouse that produces electric blue fur, which is not a fur color observed in nature. You notice that females prefer males that have the blue fur when given a choice test for mates. This result supports which of the following models of sexual selection? a. Sexual selection for indirect benefits b. Sexual selection for direct benefits c. Sexual selection for arbitrary traits d. None of the abovearrow_forward
- Many species of birds choose their mates based on how brightly colored they are. If feather color is heritable, how would this violate the assumptions required for a population to be in Hardy-Weinberg equillibrium? HW equilibrium would cause mutations in such a species. A. This is a founder effect В. This is a bottleneck effect C. OD. Mating is non-random. Alleles for brightly colored phenotypes might become more common in the species and allele frequency would change.arrow_forwardSkin pattern in a new frog species is controlled by three alleles of the same gene. Two alleles, Green Spots and White Stripes, are codominant and are both recessive to Black. Which of the choices below includes ALL the phenotypes expected to exist in the frog population in the wild ? A. White Stripes, Green Spots, White Stripes and Green spots B. Green Stripes, White Spots and uniform Black C. Green spots, White Stripes, Green Spots and White Stripes, Uniform black D. Uniform Black, Black spots, White Stripes, Green Stripes and White spots E. White Stripes, Green Spots, Black Stripes, Black Spots, Green spots & white stripesarrow_forwardThere 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?arrow_forward
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