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 24PDQ
Horses can be cremello (a light cream color), chestnut (a reddish brown color), or palomino (a golden color with white in the horse's tail and mane).
Of these
cremello
|
→ | 1/2 cremello 1/2 palomino |
chestnut
|
→ | 1/2 chestnut 1/2 palomino |
palomino
|
→ | 1/4 chestnut 1/ 2 palomino 1/4 cremello |
(a) From these results, determine the mode of inheritance by assigning gene symbols and indicating which genotypes yield which phenotypes.
(b) Predict the F1 and F2 results of many initial matings between cremello and chestnut horses.
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Three coat-color patterns that occur in some breeds of horses aretermed cremello (beige), chestnut (brown), and palomino (goldenwith light mane and tail). If two palomino horses are mated, theyproduce about 1/4 cremello, 1/4 chestnut, and 1/2 palomino offspring. In contrast, cremello horses and chestnut horses breed true.(In other words, two cremello horses will produce only cremellooffspring, and two chestnut horses will produce only chestnut offspring.) Explain this pattern of inheritance.
Palomino horses have a golden yellow coat, chestnut horses have a brown coat and cremello
horses have an almost white coat. A series of crosses between the 3 different types of horses
produced the following offspring:
Offspring
13 Palomino, 6 chestnut, 5 cremello
Cross
Palomino x palomino
Chestnut x chestnut
16 chestnut
Cremello x cremello
13 cremello
Palomino x chestnut
8 palomino, 9 chestnut
11 palomino, 11 cremello
23 palomino
Palomino x cremello
Chestnut x cremello
B)
Assign symbols for the alleles that determine these phenotypes, and list the GENOTYPES of
all the parents and offspring given in the table above.
1) Palomino horses have a golden yellow coat, chestnut horses have a brown coat and cremello
horses have an almost white coat. A series of crosses between the 3 different types of horses
produced the following offspring:
Cross
Offspring
Palomino x palomino
13 Palomino, 6 chestnut, 5 cremello
Chestnut x chestnut
16 chestnut
Cremello x cremello
13 cremello
Palomino x chestnut
8 palomino, 9 chestnut
11 palomino, 11 cremello
23 palomino
Palomino x cremello
Chestnut x cremello
A) Explain the inheritance of the palomino, chestnut, and cremello phenotypes in horses.
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 -
24. Horses can be cremello (a light cream...Ch. 4 - Pigment in the mouse is produced only when the C...Ch. 4 - Five human matings numbered 1–5 are shown in the...Ch. 4 - Two mothers give birth to sons at the same time at...Ch. 4 - In Dexter and Kerry cattle, animals may be polled...Ch. 4 - What genetic criteria distinguish a case of...Ch. 4 -
30. The specification of the anterior-posterior...Ch. 4 - The maternal-effect mutation bicoid(bcd)is...Ch. 4 -
32. Students taking a genetics exam were...Ch. 4 - In four o'clock plants, many flower colors are...Ch. 4 - Prob. 34PDQ
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