Question 1

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) C) and E)
G) C) and D) E

Question 2

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

Accepted Answer

A)   Jacobs syndrome.
B)   cri du chat syndrome.
C)   Turner syndrome.
D)   Klinefelter syndrome.
E)   a poly-X female state.F) A) and B)
G) A) and C)

Question 3

The ____ gene causes mental retardation by increasing the levels of purines in the blood.

Accepted Answer

A)   Gart
B)   Dart
C)   RFLP
D)   SRY
E)   BarrF) A) and E)
G) D) and E)

Question 4

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) B) and D)
G) A) and C)

Question 5

Which disorder is characterized by a lack of the protein dystrophin?

Accepted Answer

A)   hemophilia
B)   color blindness
C)   muscular dystrophy
D)   Down syndrome
E)   cystic fibrosisF) C) and D)
G) C) and E)

Question 6

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 theseF) C) and D)
G) A) and D)

Question 7

Which of the following conditions is NOT due to a sex-linked gene?

Accepted Answer

A)   color blindness
B)   hemophilia
C)   muscular dystrophy
D)   Klinefelter syndrome
E)   inability to see red or greenF) B) and C)
G) A) and E)

Question 8

Which statement is true regarding the Barr body?

Accepted Answer

A)   It is found in the nuclei of females.
B)   It is found in the nuclei of males.
C)   It is found in the cytoplasm of males.
D)   It is found in the cytoplasm of females.
E)   It is a condensed inactive Y chromosome.F) A) and D)
G) B) and D)

Question 9

The location of a gene on a chromosome is called

Accepted Answer

A)   A locus
B)   Homologous
C)   A linkage map
D)   A linkage group
E)   An alleleF) C) and E)
G) A) and B)

Question 10

A female that does not undergo puberty or menstruate or lacks breast development may have

Accepted Answer

A)   Klinefelter syndrome.
B)   Down syndrome.
C)   cri du chat syndrome.
D)   Turner syndrome.
E)   poly-X female state.F) B) and D)
G) A) and B)

Question 11

The most common autosomal abnormality present in people is

Accepted Answer

A)   XXX.
B)   XXY.
C)   XO.
D)   a deletion in chromosome 5.
E)   an extra chromosome 21.F) B) and D)
G) A) and E)

Question 12

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) C) and D)
G) A) and E)

Question 13

A male who is color-blind marries a heterozygous woman.What percent of their male children will be color-blind?

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   75%
E)   100%F) A) and B)
G) A) and C) C

Question 14

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 theseF) A) and B)
G) A) and C)

Question 15

The cri du chat syndrome represents a chromosomal mutation type termed

Accepted Answer

A)   translocation.
B)   duplication.
C)   deletion.
D)   inversion.
E)   polyploidy.F) None of the above
G) A) and E)

Question 16

If a person has a portion of number 5 chromosome missing,they may have

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

Color-blindness is inherited as an X-linked recessive trait.A male who is color-blind marries a heterozygous woman.What percent of their total children will be color-blind?

Accepted Answer

A)   0%
B)   25%
C)   50%
D)   75%
E)   100%F) A) and D)
G) A) and E) C

Question 20

Which refers to the loss of a complete chromosome?

Accepted Answer

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

Exam 24: Chromosomal Basis of Inheritance

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

Correct AnswerverifiedE

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

Correct AnswerverifiedShow Answer

The ____ gene causes mental retardation by increasing the levels of purines in the blood.

Correct AnswerverifiedShow Answer

Which statement is NOT true about Down syndrome?

Correct AnswerverifiedShow Answer

Which disorder is characterized by a lack of the protein dystrophin?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following conditions is NOT due to a sex-linked gene?

Correct AnswerverifiedShow Answer

Which statement is true regarding the Barr body?

Correct AnswerverifiedShow Answer

The location of a gene on a chromosome is called

Correct AnswerverifiedShow Answer

A female that does not undergo puberty or menstruate or lacks breast development may have

Correct AnswerverifiedShow Answer

The most common autosomal abnormality present in people is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A male who is color-blind marries a heterozygous woman.What percent of their male children will be color-blind?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

The cri du chat syndrome represents a chromosomal mutation type termed

Correct AnswerverifiedShow Answer

If a person has a portion of number 5 chromosome missing,they may have

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Color-blindness is inherited as an X-linked recessive trait.A male who is color-blind marries a heterozygous woman.What percent of their total children will be color-blind?

Correct AnswerverifiedC

Which refers to the loss of a complete chromosome?

Correct AnswerverifiedShow Answer

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E

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C

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

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C

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