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Sex-linked Inheritance Answers

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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
2
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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
3

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
4

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.
5

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.
6

How are the alleles for sex-linked traits inherited?

A
They are passed from the Y chromosome in parents to the X chromosome in offspring.
B
They are passed from the X chromosome in parents to the XY chromosome in offspring.
C
They are passed from parents to offspring on the X and Y chromosomes.
D
They are passed from any chromosome in the parents to the X or Y chromosome in the offspring.
7

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
8

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.
9

Which combination of alleles are always involved in the inheritance of a sex-linked trait?

A
heterozygous alleles
B
homozygous alleles
C
alleles that are carried on X and Y chromosomes
D
alleles that are carried on all chromosomes except the X and Y chromosomes
10

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

A
Yh
B
Xh
C
XH
D
YH

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