CMU Genetics Week 2 Chapter 3 &
4 Test With Solution
What is the distinctive pattern of inheritance found for X-linked recessive
traits?
a. Affects only males.
b. Affected males have an affected father.
c. Hemizygous males and homozygous females are affected.
d. Mutant characters are combined.
e. Affected individuals will always have an affected parent and an unaffected
parent. - ANSWER c. Hemizygous males and homozygous females are
affected.
Which of the following statements is true about sex-linked traits?
a. X-linked recessive genes are never expressed in males.
b. In general, males are affected by X-linked recessive disorders far more
frequently than females.
c.Fathers do not donate their Y chromosome to their sons.
d. All of these statements are true. - ANSWER b. In general, males are
affected by X-linked recessive disorders far more frequently than females.
Congenital generalized hypertrichosis (CGH) is an X-linked dominant
condition that produces dense hair on the face and upper body. What is the
,chance that a male affected by this condition will pass it on to his daughters
(assume the mother is unaffected)?
a. 0%
b. 25%
c. 50%
d. 100%
e. 75% - ANSWER D: 100%
Which of the following trisomies is the least likely to lead to a live births?
Trisomy 21.
Trisomy 13.
Trisomy 18.
Trisomy 1.
All of these trisomies can lead to live births. - ANSWER Trisomy 1
Different versions of genes are called_____.
, Homologues
Alleles
Autosomes
Sister Chromatids
Centromeres - ANSWER alleles
Jacobs syndrome involves
an extra Y chromosome (XYY)
an extra X chromosome (XXX)
a deletion of Y the chromosome
a deletion of X chromosome
4 Test With Solution
What is the distinctive pattern of inheritance found for X-linked recessive
traits?
a. Affects only males.
b. Affected males have an affected father.
c. Hemizygous males and homozygous females are affected.
d. Mutant characters are combined.
e. Affected individuals will always have an affected parent and an unaffected
parent. - ANSWER c. Hemizygous males and homozygous females are
affected.
Which of the following statements is true about sex-linked traits?
a. X-linked recessive genes are never expressed in males.
b. In general, males are affected by X-linked recessive disorders far more
frequently than females.
c.Fathers do not donate their Y chromosome to their sons.
d. All of these statements are true. - ANSWER b. In general, males are
affected by X-linked recessive disorders far more frequently than females.
Congenital generalized hypertrichosis (CGH) is an X-linked dominant
condition that produces dense hair on the face and upper body. What is the
,chance that a male affected by this condition will pass it on to his daughters
(assume the mother is unaffected)?
a. 0%
b. 25%
c. 50%
d. 100%
e. 75% - ANSWER D: 100%
Which of the following trisomies is the least likely to lead to a live births?
Trisomy 21.
Trisomy 13.
Trisomy 18.
Trisomy 1.
All of these trisomies can lead to live births. - ANSWER Trisomy 1
Different versions of genes are called_____.
, Homologues
Alleles
Autosomes
Sister Chromatids
Centromeres - ANSWER alleles
Jacobs syndrome involves
an extra Y chromosome (XYY)
an extra X chromosome (XXX)
a deletion of Y the chromosome
a deletion of X chromosome
