Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 3PDQ
In Shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate
red |
|
red | → | all red |
white |
|
white | → | all white |
red |
|
white | → | all roan |
roan |
|
roan | → | 1/4 red: 1/2 |
roan: 1/4 white |
(a) How is coat color inherited? What are the genotypes of parents and offspring for each cross?
(b) Does the roan phenotype illustrate a case of incomplete dominance or a case of codominance? Explain.
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In shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a mixture of red and white hairs. The following data were obtained from various crosses: red * red ¡ all red white * white ¡ all white red * white ¡ all roan roan * roan ¡ 1/4 red:1/2 roan: 1/4 white How is coat color inherited? What are the genotypes of parents and offspring for each cross?
Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of each offspring with the following genotypes:
(Note: 4 alleles – red; 3 – medium red; 2 – intermediate red; 1 – light red; 0 – white).
CAPITAL letters only and with spaces when applicable.
AABb -
AaBb -
AABB -
aaBb -
aabb -
J.W. McKay crossed a stock (true-breeding) melon plant that produced tan seeds with a plant
that only produced red seeds and obtained the following results (J.W. McKay. 1936. Journal of
Heredity 27:110-112).
Cross
F1
F2
Tan x red
13 tan
93 tan, 24 red
a) Explain the inheritance of tan seeds and red seeds in this plant.
b) Assign symbols for the alleles in this cross and draw out the Punnett Squares for the initial
cross and the F1 cross.
Chapter 4 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 4 - CASE STUDY | But he isn't deaf Researching their...Ch. 4 -
CASE STUDY | But he isn’t deaf
Researching...Ch. 4 - CASE STUDY | But he isn't deaf Researching their...Ch. 4 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 4 - Review the Chapter Concepts list on page 53. These...Ch. 4 - In Shorthorn cattle, coat color may be red, white,...Ch. 4 -
4. With regard to the ABO blood types in humans,...Ch. 4 - In foxes, two alleles of a single gene, P and p,...Ch. 4 - Three gene pairs located on separate autosomes...Ch. 4 - As in the plants of Problem 6, color may be red,...
Ch. 4 -
8. The following genotypes of two independently...Ch. 4 - Given the inheritance pattern of coat color in...Ch. 4 - A husband and wife have normal vision, although...Ch. 4 - In humans, the ABO blood type is under the control...Ch. 4 - In goals, development of the beard is due to a...Ch. 4 -
13. In cats, orange coal color is determined by...Ch. 4 - In Drosophila, an X-linked recessive mutation,...Ch. 4 - Another recessive mutation in Drosophila, ebony...Ch. 4 - While vermilion is X-linked in Drosophila and...Ch. 4 - In pigs, coat color may be sandy, red, or white. A...Ch. 4 - A geneticist from an alien planet that prohibits...Ch. 4 - In another cross, the frog geneticist from Problem...Ch. 4 - In cattle, coats may be solid white, solid black,...Ch. 4 - Consider the following three pedigrees, all...Ch. 4 - Labrador retrievers may be black, brown, or golden...Ch. 4 - Three autosomal recessive mutations in Drosophila,...Ch. 4 -
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