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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