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Sex-linked Inheritance Answers

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1
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Which statement about inheritance is true?

A
Girls get most of their traits from their moms; boys get most of their traits from their dads.
B
Male offspring will always have an X-linked genetic disease if the mom is a carrier.
C
Fathers always determine the gender of the offspring in humans.
D
Males never have Y chromosomes.
2
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What is the purpose of using a pedigree?

A
to study the causes of traits that are acquired during an organism’s life
B
to understand patterns of inheritance in organisms
C
to determine mating patterns in organisms
D
to identify traits that are acquired during an organism’s life
3

Duchenne muscular dystrophy is an X-linked recessive disorder. What is the probability that a female offspring of the cross that is shown above would have a recessive allele for Duchenne muscular dystrophy disorder?

Question illustration
A
0 percent
B
25 percent
C
50 percent
D
100 percent
4

Hemophilia is an X-linked recessive disorder. What is the probability of the offspring having hemophilia for the cross that is shown in the Punnett square?

Question illustration
A
0 percent
B
25 percent
C
50 percent
D
75 percent
5

Which is not considered a sex-linked trait?

A
purple flower color in pea plants
B
eye color in fruit flies
C
red-green color blindness in humans
D
hemophilia in humans
6

What is genotype for a recessive trait found on the female chromosome?

A
Yh
B
Xh
C
XH
D
YH
7

Which statement is always true when describing sex-linked inheritance?

A
It results in a dominant trait.
B
The alleles are found on the X or Y chromosome.
C
The resulting trait is influenced by multiple alleles.
D
It is affected by alleles on at least three different chromosomes.
8

What was Thomas Hunt Morgan's main contribution to science?

A
He discovered that certain traits were linked to the X chromosome.
B
He was the first to use fruit flies in research.
C
He created the first white-eyed female Drosophila.
D
He created the first white-eyed male Drosophila.
9

Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. Based on the pedigree that is shown, which describes John?

Question illustration
A
carrier for hemophilia
B
expresses hemophilia
C
does not have hemophilia
D
expresses hemophilia and died of complications
10

Which allele combination represents a female who is heterozygous for a sex-linked trait?

A
XRY
B
XrY
C
XRXr
D
XRXR

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