EBK CONCEPTS OF GENETICS
12th Edition
ISBN: 9780134818979
Author: Killian
Publisher: YUZU
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Chapter 25, Problem 7PDQ
Erma and Harvey were a compatible barnyard pair, but a curious sight. Harvey’s tail was only 6 cm long, while Erma’s was 30 cm. Their F1 piglet offspring all grew tails that were 18 cm. When inbred, an F2 generation resulted in many piglets (Erma and Harvey’s grandpigs), whose tails ranged in 4-cm intervals from 6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails, while 1/64 had 6-cm tails and 1/64 had 30-cm tails.
- (a) Explain how these tail lengths were inherited by describing the mode of inheritance, indicating how many gene pairs were at work, and designating the genotypes of Harvey, Erma, and their 18-cm-tail offspring.
- (b) If one of the 18-cm-tail F1 pigs is mated with one of the 6-cm-tail F2 pigs, what
phenotypic ratio will be predicted if many offspring resulted? Diagram the cross.
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Erma and Harvey were a compatible barnyard pair, but a curioussight. Harvey’s tail was only 6 cm long, while Erma’s was 30 cm.Their F1 piglet offspring all grew tails that were 18 cm. Wheninbred, an F2 generation resulted in many piglets (Erma andHarvey’s grandpigs), whose tails ranged in 4-cm intervals from6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails,while 1/64 had 6-cm tails and 1/64 had 30-cm tails.
Que: If one of the 18-cm F1 pigs is mated with one of the 6-cmF2 pigs, what phenotypic ratio would be predicted if manyoffspring resulted? Diagram the cross.
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Chapter 25 Solutions
EBK CONCEPTS OF GENETICS
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