sex linked
traits
practice
by laney lee
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sex linked traits
Name: _____________
rd
23
As you may already know, the
pair
of chromosomes, called your sex
chromosomes, are the ones which
determine your sex. Men are XY and
women are XX (The other 22 pairs are
known as autosomal chromosomes.)
It’s easy to see in the karyotype at the
right that the X chromosome is quite
larger than the Y, and therefore
contains more genetic information. Sex
linked traits are those that are located
on the X chromosome.
The implications of this are that for recessive disorders carried only on the X, men
are more susceptible due to their single X chromosome. Women, on the other hand,
have the possibility of being heterozygous and not expressing the disorder. In this
case they will be called a carrier. Carriers have the genetic information for the
disorder, and may pass it on to their children, though they do not express the
disorder themselves.
FILL IN THE BLANK
B
B
X X
B
X Y
B
b
X X
b
XY
b
b
XX
Match the genotypes above to the descriptions. Red green colorblindness is a
recessive sex linked disorder.
1. A healthy, homozygous female
___________
2. A colorblind male
___________
3. A carrier female
___________
4. A healthy male
___________
5. A colorblind female
___________
6. A normal sighted woman with a colorblind father
___________
©Laney Lee 2020
sex linked traits
B
b
X X
x
b
XY
Name: _____________
b
b
XX
x
B
X Y
B
B
X X
x
b
XY
7. What is the
probability that this
couple will have a
colorblind son?
_______
9. What is the
probability that this
couple will have a
colorblind son?
_______
11. What is the
probability that this
couple will have a
colorblind son?
_______
8. What is the
probability that this
couple will have a
colorblind daughter?
_______
10. What is the
probability that this
couple will have a
colorblind daughter?
_______
12. What is the
probability that this
couple will have a
colorblind daughter?
_______
Hemophilia is. A recessive sex linked disorder. People who have hemophilia are
called hemophiliacs.
13. A healthy woman whose father was a hemophiliac marries a
healthy man.
Mother’s Genotype: ______
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
What is the probability that they have a daughter who is a carrier?
14. A hemophiliac woman marries a healthy man.
Mother’s Genotype: ______
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
©Laney Lee 2020
sex linked traits
Name: _____________
15. A woman who is a carrier for hemophilia marries a
hemophiliac man.
Mother’s Genotype: ______
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
What is the probability that they have a daughter who is a
carrier?
16. A hemophiliac woman marries a hemophiliac man.
Mother’s Genotype: ______
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
What is the probability that they have a daughter who is a
carrier?
17. What is a sex linked trait?
18. Men who inherit sex linked disorders always inherit it from the same parent. Is it
the mom or the dad? How do you know?
©Laney Lee 2020
sex linked
traits
key
by laney lee
sex linked traits
Name: _____________
rd
23
As you may already know, the
pair
of chromosomes, called your sex
chromosomes, are the ones which
determine your sex. Men are XY and
women are XX (The other 22 pairs are
known as autosomal chromosomes.)
It’s easy to see in the karyotype at the
right that the X chromosome is quite
larger than the Y, and therefore
contains more genetic information. Sex
linked traits are those that are located
on the X chromosome.
The implications of this are that for recessive disorders carried only on the X, men
are more susceptible due to their single X chromosome. Women, on the other hand,
have the possibility of being heterozygous and not expressing the disorder. In this
case they will be called a carrier. Carriers have the genetic information for the
disorder, and may pass it on to their children, though they do not express the
disorder themselves.
FILL IN THE BLANK
B
B
X X
B
X Y
B
b
X X
b
XY
b
b
XX
Match the genotypes above to the descriptions. Red green colorblindness is a
recessive sex linked disorder.
1. A healthy, homozygous female
2. A colorblind male
___________
b
X Y
___________
B
b
X X
3. A carrier female
___________
4. A healthy male
B
X Y
5. A colorblind female
B
B
X X
___________
b
b
X X
___________
6. A normal sighed woman with a colorblind father
B
b
X X
___________
©Laney Lee 2020
sex linked
traits
B
X
b
X
b
X
b
X
B
b
X X
b
b
XX
Y
B
X Y
b
X Y
B
b
X X
Name: _____________
x
b
XY
B
b
B
X
X
X
Y
b
X
B
b
X X
b
XY
b
b
XX
B
X
b
X
Y
b
XY
x
B
X Y
B
X
B
b
X X
B
b
X X
B
X Y
B
X Y
B
B
X X
x
b
XY
7. What is the
probability that this
couple will have a
colorblind son?
25%
_______
9. What is the
probability that this
couple will have a
colorblind son?
50%
_______
11. What is the
probability that this
couple will have a
colorblind son?
50%
_______
8. What is the
probability that this
couple will have a
colorblind daughter?
_______
25%
10. What is the
probability that this
couple will have a
colorblind daughter?
_______
0%
12. What is the
probability that this
couple will have a
colorblind daughter?
_______
0%
Hemophilia is. A recessive sex linked disorder. People who have hemophilia are
called hemophiliacs.
13. A healthy woman whose father was a hemophiliac marries a
healthy man.
B
b
X
X
Mother’s Genotype: ______
B
X
Y
Father’s Genotype: ______
B
X
Y
B
X
b
X
B
B
X X
B
b
X X
B
X
Y
b
XY
b
X
b
X
What is the probability that they have a child with hemophilia?
25%
What is the probability that they have a daughter who is a carrier?
25%
14. A hemophiliac woman marries a healthy man.
b
b
X
X
Mother’s Genotype: ______
B
X Y
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
B
X
Y
B
b
X X
B
b
X X
b
X Y
b
XY
25%
©Laney Lee 2020
sex linked traits
Name: _____________
15. A woman who is a carrier for hemophilia marries a
hemophiliac man.
B
X
b
X
b
X
B
b
X X
b
b
XX
Y
B
X Y
b
X Y
b
X
b
X
B
b
X X
Mother’s Genotype: ______
b
X Y
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
50%
What is the probability that they have a daughter who is a
carrier?
25%
16. A hemophiliac woman marries a hemophiliac man.
b
b
X X
Mother’s Genotype: ______
b
X Y
b
X
b
b
X X
b
b
X X
b
X Y
b
XY
Father’s Genotype: ______
What is the probability that they have a child with hemophilia?
Y
100%
What is the probability that they have a daughter who is a
carrier?
0%
17. What is a sex linked trait?
A sex linked trait is a trait determined by a gene that is carried only
on the X chromosome
18. Men who inherit sex linked disorders always inherit it from the same parent. Is it
the mom or the dad? How do you know?
Men inherit sex linked traits from their mother, since they always
receive their X chromosome from their mother and their Y
chromosome from their father.
©Laney Lee 2020
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