Science Worksheet - Grade 8 Intermediate Level - The University Of The State Of New York - 2012 Page 17
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32Base your answers to questions 56 and 57 on the Punnett square below and on your knowledge of science.
The Punnett square shows a cross between a mouse with black fur whose genetic makeup was BB, and
a mouse with white fur whose genetic makeup was bb.
BB
B
B
b
bb
Bb
Bb
Key
b
B = black
b = white
Bb
Bb
56 Explain why all of the offspring have black fur, even though each of them has a gene for white fur. [
]
1
______________________________________________________________________________________
______________________________________________________________________________________
57 A second cross was done using a different pair of mice. One parent was a mouse with white fur (bb). The
other parent was a mouse with black fur. Some of the offspring produced from this cross had white fur.
What genetic makeup did this parent with black fur have in order to produce some offspring with white
fur? [
]
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Genetic makeup: ____________
[17]
[OVER]
Grade 8 Science — June ’12
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