A particular breed of dog can have long hair or short hair. Whentrue-breeding long-haired animals were crossed to true-breedingshort-haired animals, the offspring all had long hair. The F2 generation showed a 3:1 ratio of long- to short-haired offspring. Asecond gene affects the texture of the hair. The two variants arewiry hair and straight hair. F1 offspring from a cross of these twovarieties all had wiry hair, and F2 offspring showed a 3:1 ratio ofwiry-haired to straight-haired puppies. Recently, a breeder of theshort- and wiry-haired dogs found a female puppy that was albino.Similarly, another breeder of the long- and straight-haired dogsfound a male puppy that was albino. Because the albino trait is always due to a recessive allele, the two breeders got together andmated the two dogs. Surprisingly, all of the puppies in the litterhad black hair. How can you explain this result?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A particular breed of dog can have long hair or short hair. When
true-breeding long-haired animals were crossed to true-breeding
short-haired animals, the offspring all had long hair. The F2 generation showed a 3:1 ratio of long- to short-haired offspring. A
second gene affects the texture of the hair. The two variants are
wiry hair and straight hair. F1 offspring from a cross of these two
varieties all had wiry hair, and F2 offspring showed a 3:1 ratio of
wiry-haired to straight-haired puppies. Recently, a breeder of the
short- and wiry-haired dogs found a female puppy that was albino.
Similarly, another breeder of the long- and straight-haired dogs
found a male puppy that was albino. Because the albino trait is always due to a recessive allele, the two breeders got together and
mated the two dogs. Surprisingly, all of the puppies in the litter
had black hair. How can you explain this result?

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