AnswersFL-2000310-Biology 1 Sem 1 - FlexSex-linked Inheritance

Sex-linked Inheritance Answers

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Which symbol is used to label a male that expresses a sex-linked disorder on a pedigree?

A
An empty circle.
Option A
B
A half-filled circle.
Option B
C
An empty square.
Option C
D
A filled square.
Option D
2
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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, if Charles and Marie have a daughter in the future, what is the probability that she will have hemophilia?

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

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
5

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
6

Drosophila eye color is an X-linked trait. Red eye color is dominant, and white eye color is recessive. Which Punnett square shows a cross in which the probability of offspring will have red eyes is 100 percent?

A
A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x Upper R. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X r, Upper X Upper R Y, X Upper R Upper Y, X Upper R Upper X r.
Option A
B
A Punnett square is shown. The columns are labeled Upper X Upper R and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X Upper R, Upper X Upper R Upper Y, Upper X r Upper Y, Upper X uppercase Upper R Upper X r.
Option B
C
A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x r and x r. Clockwise, from top-left, the boxes include: Upper X r Upper X r, Upper X r Upper Y, Upper X r Upper Y, Upper X r Upper X r.
Option C
D
A Punnett square is shown. The columns are labeled Upper X r and Upper Y. The rows are labeled x Upper R and x r. Clockwise, from top-left, the boxes include: Upper X Upper R Upper X r, Upper X Upper R Y, Upper X r Upper Y, Upper X r Upper X r.
Option D
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

Which pedigree symbol is used to represent a female carrier of a recessive X-linked trait?

A
An empty circle.
Option A
B
A half-filled circle.
Option B
C
An empty square.
Option C
D
A filled square.
Option D
9

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.
10

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.
11

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.
12

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

A
Yh
B
Xh
C
XH
D
YH
13

Which allele combination represents a female who is a carrier for an X-linked recessive disorder?

A
XRXr
B
XrXr
C
XRY
D
XrY
14

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
15

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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