Question 1

Hemophilia (h) is a sex-linked recessive trait.If a hemophiliac male marries a carrier female,

Accepted Answer

A)  50% of their daughters will be hemophiliac.
B)  75% of their daughters will be hemophiliac.
C)  25% of their daughters will be hemophiliac.
D)  25% of their sons will be hemophiliac.
E)  75% of their sons will be hemophiliac.F) B) and D)
G) A) and B)

Question 2

Which of the following sex-linked disorders is characterized by an abnormal number of repeat sequences in the genome?

Accepted Answer

A)  fragile X syndrome
B)  hemophilia
C)  color-blindness
D)  Duchenne muscular dystrophy
E)  None of the answer choices is true.F) All of the above
G) None of the above

Question 3

A person with an XO genotype is classified as having

Accepted Answer

A)  Down syndrome.
B)  cri du chat syndrome.
C)  Turner syndrome.
D)  Klinefelter syndrome.
E)  a poly-X state.F) None of the above
G) A) and B)

Question 4

Which refers to the loss of a portion of a chromosome?

Accepted Answer

A)  inversion
B)  translocation
C)  deletion
D)  duplication
E)  monosomyF) A) and C)
G) A) and B)

Question 5

Which of the following sex-linked diseases is characterized by the absence of a clotting factor?

Accepted Answer

A)  hemophilia
B)  fragile X syndrome
C)  color-blindness
D)  Duchenne muscular dystrophy
E)  None of the answer choices is true.F) A) and E)
G) A) and D)

Question 6

If a chromosomal segment is turned around 180 °\degree° ,the chromosomal mutation is termed a(n)

Accepted Answer

A)  translocation.
B)  duplication.
C)  deletion.
D)  inversion.
E)  monosomy. F) All of the above
G) A) and D)

Question 7

A female with two Barr bodies in her cells would have what combination of sex chromosomes?

Accepted Answer

A)  XXY
B)  XXXY
C)  XXX
D)  XX
E)  XYYF) A) and C)
G) A) and B) C

Question 8

If an individual has a XYY genotype,they are classified as having

Accepted Answer

A)  Down syndrome.
B)  cri du chat syndrome.
C)  Turner syndrome.
D)  Klinefelter syndrome.
E)  Jacobs syndrome.F) A) and B)
G) B) and D)

Question 9

When homologous chromosomes fail to separate during meiosis,this is termed

Accepted Answer

A)  linked genes.
B)  disjunction.
C)  nondisjunction.
D)  crossover.
E)  monosomy.F) C) and D)
G) D) and E)

Question 10

A karyotype will NOT reveal which of the following genetic diseases?

Accepted Answer

A)  Turner syndrome
B)  Klinefelter syndrome
C)  Down syndrome
D)  cri du chat syndrome
E)  hemophiliaF) B) and C)
G) B) and E)

Question 11

A normal male marries a color-blind woman.What percent of their female children will be color-blind?

Accepted Answer

A)  0%
B)  25%
C)  50%
D)  75%
E)  100%F) None of the above
G) A) and B)

Question 12

If a person inherits two X chromosomes,this individual will be

Accepted Answer

A)  female.
B)  male.
C)  color-blind.
D)  sterile.
E)  a poly-X female.F) A) and B)
G) A) and C)

Question 13

Down syndrome

Accepted Answer

A)  is due to disjunction of chromosomes.
B)  individuals have two number 21 chromosomes.
C)  may occur at a lower rate in women over 40.
D)  can occur if the sperm has an extra number 21 chromosome.
E)  persons have normal-appearing eyelids.F) B) and D)
G) All of the above D

Question 14

Which statement is NOT true about Down syndrome?

Accepted Answer

A)  It is caused by a third copy of chromosome 21.
B)  Greatly increased incidence occurs with fathers over age 40.
C)  It is usually associated with chromosomal nondisjunction in meiosis.
D)  Characteristics include mental retardation and extra eyelid folds.
E)  Affected individuals display mental retardation.F) A) and D)
G) C) and D) B

Question 15

Which refers to the movement of a piece of one chromosome to another nonhomologous chromosome?

Accepted Answer

A)  inversion
B)  translocation
C)  deletion
D)  duplication
E)  monosomyF) B) and E)
G) B) and D)

Question 16

A person who has an extra copy of a chromosome is said to have

Accepted Answer

A)  monosomy.
B)  bisomy.
C)  trisomy.
D)  nondisjunction.
E)  duplication.F) B) and C)
G) A) and E)

Question 17

An XXX female would most likely result from nondisjunction in

Accepted Answer

A)  the mother during egg formation.
B)  the father during sperm formation.
C)  in both the mother and father during gamete formation.
D)  the fertilized egg.
E)  neither the mother nor the father.F) A) and B)
G) A) and C)

Question 18

If a woman is a carrier for the color-blind recessive allele and her husband has normal vision,what are their chances that a son will be color-blind?

Accepted Answer

A)  None,because the father is normal.
B)  50%,since the mother is only a carrier.
C)  100% because the mother has the gene.
D)  25% because the mother is a hybrid.
E)  None since the son will also be just a carrier.F) A) and B)
G) B) and D)

Question 19

Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _____ resulted in nondisjunction in ____.

Accepted Answer

A)  XXY; oogenesis
B)  XYY; spermatogenesis
C)  XXX; oogenesis
D)  XXY; spermatogenesis
E)  XO; oogenesisF) C) and E)
G) A) and B)

Question 20

Considering that males can have Klinefelter (XXY) syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO) syndrome,poly-X (XXX,XXXX) ,and normal XX combinations,it is obvious that

Accepted Answer

A)  maleness results from the presence of only one X chromosome.
B)  maleness results from the absence of two or more X chromosomes.
C)  maleness results from the minimal presence of one Y chromosome.
D)  femaleness results from the presence of two or more X chromosomes.
E)  sex determination is a delicate balance between X and Y chromosomes.F) B) and C)
G) A) and B)

Exam 24: Chromosomal Inheritance and Genetic Disorders

Hemophilia (h) is a sex-linked recessive trait.If a hemophiliac male marries a carrier female,

Correct AnswerverifiedShow Answer

Which of the following sex-linked disorders is characterized by an abnormal number of repeat sequences in the genome?

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A person with an XO genotype is classified as having

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Which refers to the loss of a portion of a chromosome?

Correct AnswerverifiedShow Answer

Which of the following sex-linked diseases is characterized by the absence of a clotting factor?

Correct AnswerverifiedShow Answer

If a chromosomal segment is turned around 180 °\degree° ,the chromosomal mutation is termed a(n)

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A female with two Barr bodies in her cells would have what combination of sex chromosomes?

Correct AnswerverifiedC

If an individual has a XYY genotype,they are classified as having

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When homologous chromosomes fail to separate during meiosis,this is termed

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A karyotype will NOT reveal which of the following genetic diseases?

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A normal male marries a color-blind woman.What percent of their female children will be color-blind?

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If a person inherits two X chromosomes,this individual will be

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Down syndrome

Correct AnswerverifiedD

Which statement is NOT true about Down syndrome?

Correct AnswerverifiedB

Which refers to the movement of a piece of one chromosome to another nonhomologous chromosome?

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A person who has an extra copy of a chromosome is said to have

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An XXX female would most likely result from nondisjunction in

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If a woman is a carrier for the color-blind recessive allele and her husband has normal vision,what are their chances that a son will be color-blind?

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Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _____ resulted in nondisjunction in ____.

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Considering that males can have Klinefelter (XXY) syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO) syndrome,poly-X (XXX,XXXX) ,and normal XX combinations,it is obvious that

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If a chromosomal segment is turned around 180 $\degree$ ,the chromosomal mutation is termed a(n)

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C

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D

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B

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Generally,it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis.However,it is possible to assert that _ resulted in nondisjunction in .

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