A third-grader decided to breed guinea pigs for herschool science project. She went to a pet store andbought a male with smooth black fur and a femalewith rough white fur. She wanted to study the inheritance of those features and was sorry to see that thefirst litter of eight contained only rough black animals. To her disappointment, the second litter fromthose same parents contained seven rough black animals. Soon the first litter had begun to produce F2 offspring, and they showed a variety of coat types.Before long, the child had 125 F2 guinea pigs. Eightof them had smooth white coats, 25 had smooth blackcoats, 23 were rough and white, and 69 were roughand black.a. How are the coat color and texture characteristicsinherited? What evidence supports yourconclusions?b. What phenotypes and proportions of offspringshould the girl expect if she mates one of thesmooth white F2 females to an F1 male?
A third-grader decided to breed guinea pigs for her
school science project. She went to a pet store and
bought a male with smooth black fur and a female
with rough white fur. She wanted to study the inheritance of those features and was sorry to see that the
first litter of eight contained only rough black animals. To her disappointment, the second litter from
those same parents contained seven rough black animals. Soon the first litter had begun to produce F2 offspring, and they showed a variety of coat types.
Before long, the child had 125 F2 guinea pigs. Eight
of them had smooth white coats, 25 had smooth black
coats, 23 were rough and white, and 69 were rough
and black.
a. How are the coat color and texture characteristics
inherited? What evidence supports your
conclusions?
b. What
should the girl expect if she mates one of the
smooth white F2 females to an F1 male?
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