Question 1

A color-blind (recessive trait) woman will pass the allele to

Accepted Answer

A)  her sons only. 
B)  all her children. 
C)  her daughters only. 
D)  none of her children. 
E)  her husband. 
A)  her sons only. 
B)  all her children. 
C)  her daughters only. 
D)  none of her children. 
E)  her husband.

Question 2

Which of the following 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)  monosomy 
A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy

Question 3

Which of the following is true about a karyotype?

Accepted Answer

A)  homologous chromosomes are arranged in pairs 
B)  sex chromosomes are identified separately from autosomes 
C)  chromosome pairs are assorted by both size and shape 
D)  banding patterns are used in pairing chromosomes 
E)  All of the answer choices are true about karyotypes. 
A)  homologous chromosomes are arranged in pairs 
B)  sex chromosomes are identified separately from autosomes 
C)  chromosome pairs are assorted by both size and shape 
D)  banding patterns are used in pairing chromosomes 
E)  All of the answer choices are true about karyotypes.

Question 4

Which of the following traits is part of the linkage group found on chromosome 19?

Accepted Answer

A)  muscular dystrophy 
B)  hair color (brown) 
C)  colorectal cancer 
D)  eye color (green/blue) 
E)  All of the answer choices are part of a linkage group on chromosome 19. 
A)  muscular dystrophy 
B)  hair color (brown) 
C)  colorectal cancer 
D)  eye color (green/blue) 
E)  All of the answer choices are part of a linkage group on chromosome 19.

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 fibrosis 
A)  hemophilia 
B)  color-blindness 
C)  muscular dystrophy 
D)  Down syndrome 
E)  cystic fibrosis

Question 6

A female that has ovarian failure and does not undergo puberty may have

Accepted Answer

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

Question 7

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. 
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.

Question 8

A karyotype will detect which of the following genetic diseases?

Accepted Answer

A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Down syndrome 
D)  cri du chat syndrome 
E)  All of the answer choices listed can be detected with a karyotype. 
A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Down syndrome 
D)  cri du chat syndrome 
E)  All of the answer choices listed can be detected with a karyotype.

Question 9

A mother is a carrier for blue eyes (autosomal recessive) and for hemophilia (X-linked recessive). Which of these is a correct statement?

Accepted Answer

A)  All sons will have blue eyes and be hemophiliacs. 
B)  The phenotype depends on the father's genotype as to whether the sons will have blue eyes and/or be hemophiliacs. 
C)  The father's genotype can determine whether a son has blue eyes but will not determine whether a son will be a hemophiliac. 
D)  Regardless of the father, no sons will have blue eyes or be hemophiliacs. 
E)  Regardless of the father, the mother can only pass on blue eyes to her daughters and hemophilia to her sons. 
A)  All sons will have blue eyes and be hemophiliacs. 
B)  The phenotype depends on the father's genotype as to whether the sons will have blue eyes and/or be hemophiliacs. 
C)  The father's genotype can determine whether a son has blue eyes but will not determine whether a son will be a hemophiliac. 
D)  Regardless of the father, no sons will have blue eyes or be hemophiliacs. 
E)  Regardless of the father, the mother can only pass on blue eyes to her daughters and hemophilia to her sons.

Question 10

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

Question 11

Describe a genetic disorder associated with a deletion in a chromosome.

Accepted Answer

Williams syndrome occurs when chromosome

Question 12

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

Accepted Answer

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

Question 13

Which statement is true regarding a Barr body?

Accepted Answer

A)  Barr bodies are found in the nuclei of female cells. 
B)  Barr bodies are found in the nuclei of male cells. 
C)  Barr bodies are found in the cytoplasm of male cells. 
D)  Barr bodies are found in the cytoplasm of female cells. 
E)  A Barr body is a condensed, inactive Y chromosome. 
A)  Barr bodies are found in the nuclei of female cells. 
B)  Barr bodies are found in the nuclei of male cells. 
C)  Barr bodies are found in the cytoplasm of male cells. 
D)  Barr bodies are found in the cytoplasm of female cells. 
E)  A Barr body is a condensed, inactive Y chromosome.

Exam 24: Chromosomal Basis of Inheritance

A color-blind (recessive trait) woman will pass the allele to

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

Which of the following is true about a karyotype?

Which of the following traits is part of the linkage group found on chromosome 19?

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

A female that has ovarian failure and does not undergo puberty may have

An XXX female would most likely result from nondisjunction in

A karyotype will detect which of the following genetic diseases?

A mother is a carrier for blue eyes (autosomal recessive) and for hemophilia (X-linked recessive). Which of these is a correct statement?

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?

Describe a genetic disorder associated with a deletion in a chromosome.

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

Which statement is true regarding a Barr body?

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