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Chapter 11<br />
Name Date Class<br />
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.<br />
1<br />
You and your colleagues are constructing a<br />
pedigree for a boy with cystic fibrosis. The<br />
individual’s younger brother has also been<br />
diagnosed with cystic fibrosis. How would<br />
these brothers be represented in a pedigree<br />
A Both would be represented as completely<br />
shaded circles.<br />
B Both would be represented as completely<br />
shaded squares.<br />
C The older brother would be a shaded square,<br />
while the younger brother would be a<br />
half- shaded square.<br />
D Both would be represented as unshaded squares.<br />
2<br />
Which disorder is treated by restricting milk in<br />
the diet<br />
A phenylketonuria<br />
B cystic fibrosis<br />
C galactosemia<br />
D Tay-Sachs disease<br />
3<br />
A man carrying the allele for Huntington’s<br />
disease marries a woman who is homozygous<br />
recessive for the allele. What is the probability<br />
that their offspring will develop Huntington’s<br />
disease<br />
A 25 percent<br />
B 50 percent<br />
C 75 percent<br />
D 100 percent<br />
4<br />
Which diagram below illustrates fertilization<br />
that would lead to development of a normal<br />
human female<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
5<br />
The gene for brown eyes (B) is dominant over the<br />
gene for blue eyes (b). Two brown-eyed people<br />
have a blue-eyed child. Which genotypes make<br />
this possible<br />
A The mother and father are both homozygous<br />
brown eyed (BB).<br />
B The mother is homozygous brown eyed (BB)<br />
and the father is heterozygous brown-eyed (Bb).<br />
C The mother is heterozygous brown-eyed (Bb),<br />
and the father is homozygous brown-eyed (BB).<br />
D The mother and the father are both heterozygous<br />
brown-eyed (Bb).<br />
6<br />
During warm temperatures of summer, the<br />
arctic fox produces enzymes that cause its fur<br />
to become reddish brown. During the cold<br />
temperatures of winter, these enzymes do not<br />
function. As a result, the fox has a white coat<br />
that blends into the snowy background. What<br />
explains this change in color<br />
A The genes of a fox are made of unstable DNA.<br />
B Mutations can be caused by temperature<br />
extremes.<br />
C Random alteration of DNA can occur on certain<br />
chromosomes.<br />
D The expression of certain genes is affected by<br />
temperature.<br />
7<br />
Which does NOT play a role in determining an<br />
individual’s sex<br />
A gametes<br />
B chromosomes<br />
C meiosis<br />
D autosomes<br />
STANDARDIZED TEST PRACTICE CHAPTER 11 21
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