Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 3, Problem 15PDQ
In a study of black guinea pigs and white guinea pigs, 100 black animals were crossed with 100 white animals, and each cross was carried to an F2 generation. In 94 of the crosses, all the F1 offspring were black and an F2 ratio of 3 black: 1 white was obtained. In the other 6 cases, half of the F1 animals were black and the other half were white. Why? Predict the results of crossing the black and white F1 guinea pigs from the 6 exceptional cases.
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In a study of black guinea pigs and white guinea pigs, 100 black animals were crossed with 100 white animals, and each cross was carried to an F2 generation. In 94 of the crosses, all the F1 offspring were black and an F2 ratio of 3 black:1 white was obtained. In the other 6 cases, half of the F1 animals were black and the other half were white. Why? Predict the results of crossing the black and white F1 guinea pigs from the 6 exceptional cases.
A homozygous variety of opium poppy (Papaver somniferum Laciniatum) with lacerate leaves was crossed with another
homozygous variety with normal leaves. All the F₁ had lacerate leaves (jagged-edged leaves). Two F₁ plants were crossed to
produce the F2. Of the F2, 249 had lacerate leaves and 16 had normal leaves.
How are lacerate leaves determined in the opium poppy?
two genes, with a dominant allele at both loci
two genes, where one allele at a single locus is recessive lethal
one gene, with codominant alleles at a single locus
two genes, with a dominant allele at either or both loci
Give genotypes for all the plants in the P, F₁, and F2 generations. Some generations will have more than one genotype.
P
F₁
F₂ (lacerate)
F₂ (normal)
aabb
A_B_
Answer Bank
aaB
AaBb
A_bb
AABB
When crossing a true breeding white mouse with a true breeding brown mouse your friend tells you she recovered all black mice. But then when she crosses the F1 mice to each other she recovered 28 black mice, 8 brown mice, and 13 white mice. Can you help her explain these results? (Type out the cross and include genotypes of as many mice as possible. What phrase best describes this phenomenon? How many genes are involved are they linked or unlinked? Etc.)
Chapter 3 Solutions
Concepts of Genetics (12th Edition)
Ch. 3 - Pigeons may exhibit a checkered or plain color...Ch. 3 - Considering the Mendelian traits round versus...Ch. 3 - Using the forked-line, or branch diagram, method,...Ch. 3 - In one of Mendels dihybrid crosses, he observed...Ch. 3 - The following pedigree is for myopia...Ch. 3 - If they seek genetic counseling, what issues would...Ch. 3 - If you were in Thomass position, would you want to...Ch. 3 - If Thomas tests positive for the HD allele, should...Ch. 3 - HOW DO WE KNOW? In this chapter, we focused on the...Ch. 3 - CONCEPT QUESTION Review the Chapter Concepts list...
Ch. 3 - Albinism in humans is inherited as a simple...Ch. 3 - Which of Mendels postulates are illustrated by the...Ch. 3 - Discuss how Mendels monohybrid results served as...Ch. 3 - What advantages were provided by Mendels choice of...Ch. 3 - Mendel crossed peas having round seeds and yellow...Ch. 3 - Based on the preceding cross, what is the...Ch. 3 - Which of Mendels postulates can only be...Ch. 3 - In a cross between a black and a white guinea pig,...Ch. 3 - What is the basis for homology among chromosomes?Ch. 3 - In Drosophila, gray body color is dominant to...Ch. 3 - How many different types of gametes can be formed...Ch. 3 - Mendel crossed peas having green seeds with peas...Ch. 3 - In a study of black guinea pigs and white guinea...Ch. 3 - Mendel crossed peas having round green seeds with...Ch. 3 - Prob. 17PDQCh. 3 - The following are F2 results of two of Mendels...Ch. 3 - In assessing data that fell into two phenotypic...Ch. 3 - Prob. 20PDQCh. 3 - Consider the following pedigree. Predict the mode...Ch. 3 - Draw all possible conclusions concerning the mode...Ch. 3 - For decades scientists have been perplexed by...Ch. 3 - A wrongful birth case was recently brought before...Ch. 3 - TaySachs disease (TSD) is an inborn error of...Ch. 3 - Datura stramonium (the Jimsonweed) expresses...Ch. 3 - The wild-type (normal) fruit fly, Drosophila...Ch. 3 - To assess Mendels law of segregation using...Ch. 3 - Albinism, caused by a mutational disruption in...Ch. 3 - (a) Assuming that Migaloos albinism is caused by a...
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