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. 
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. A

Question 2

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)  XYY 
A)  XXY 
B)  XXXY 
C)  XXX 
D)  XX 
E)  XYY C

Question 3

Karyotyping can be used to diagnose which of the following genetic disorders?

Accepted Answer

A)  Down syndrome 
B)  phenylketonuria 
C)  neurofibromatosis 
D)  cystic fibrosis 
E)  hemophilia 
A)  Down syndrome 
B)  phenylketonuria 
C)  neurofibromatosis 
D)  cystic fibrosis 
E)  hemophilia A

Question 4

Which of the following is a condition in which a person inherits an extra copy of a chromosome?

Accepted Answer

A)  monosomy 
B)  disjunction 
C)  trisomy 
D)  inversion 
E)  duplication 
A)  monosomy 
B)  disjunction 
C)  trisomy 
D)  inversion 
E)  duplication

Question 5

During meiosis, what process can sometimes "unlink" genes?

Accepted Answer

A)  synapsis 
B)  crossing over 
C)  independent assortment 
D)  metaphase II 
E)  the formation of tetrads 
A)  synapsis 
B)  crossing over 
C)  independent assortment 
D)  metaphase II 
E)  the formation of tetrads

Question 6

Which of the following conditions is due to a sex-linked gene?

Accepted Answer

A)  color-blindness 
B)  hemophilia 
C)  muscular dystrophy 
D)  inability to see red or green 
E)  All of the answer choices are sex-linked conditions. 
A)  color-blindness 
B)  hemophilia 
C)  muscular dystrophy 
D)  inability to see red or green 
E)  All of the answer choices are sex-linked conditions.

Question 7

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. 
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.

Question 8

The most common autosomal abnormality seen among humans is

Accepted Answer

A)  Edwards syndrome. 
B)  XXY. 
C)  Patau syndrome. 
D)  a deletion in chromosome 5. 
E)  trisomy 21. 
A)  Edwards syndrome. 
B)  XXY. 
C)  Patau syndrome. 
D)  a deletion in chromosome 5. 
E)  trisomy 21.

Question 9

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 copy of chromosome 21. 
E)  persons have normal-appearing eyelids. 
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 copy of chromosome 21. 
E)  persons have normal-appearing eyelids.

Question 10

Which refers to the addition of a repeat segment of a chromosome?

Accepted Answer

A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy 
A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy

Question 11

In which way would males and females differ in terms of chromosomes?

Accepted Answer

A)  the total number of autosomes 
B)  the loci for the majority of their genes 
C)  the types of sex chromosomes 
D)  the inheritance of one X chromosome from their mother 
E)  the need for two sex chromosomes 
A)  the total number of autosomes 
B)  the loci for the majority of their genes 
C)  the types of sex chromosomes 
D)  the inheritance of one X chromosome from their mother 
E)  the need for two sex chromosomes

Question 12

Genes that are linked do not show independent assortment.

Accepted Answer

A) True 
 B)False

Question 13

The chances of survival are greater when trisomy or monosomy involves the sex chromosomes.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following sex-linked diseases is characterized by a waddling gait, toe walking, frequent falls, and difficulty in rising, and may appear as soon as the child starts to walk?

Accepted Answer

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

Question 15

The location of a gene on a chromosome is called

Accepted Answer

A)  a locus. 
B)  a lacunae. 
C)  a link. 
D)  a gene marker. 
A)  a locus. 
B)  a lacunae. 
C)  a link. 
D)  a gene marker.

Question 16

An individual who has an XXY combination of sex chromosomes is said to have

Accepted Answer

A)  Klinefelter syndrome. 
B)  Turner syndrome. 
C)  Down syndrome. 
D)  Fragile X syndrome. 
E)  cri du chat syndrome. 
A)  Klinefelter syndrome. 
B)  Turner syndrome. 
C)  Down syndrome. 
D)  Fragile X syndrome. 
E)  cri du chat syndrome.

Question 17

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)  male characteristics result from the presence of only one X chromosome. 
B)  male characteristics result from the absence of two or more X chromosomes. 
C)  male characteristics result from the minimal presence of one Y chromosome. 
D)  female characteristics result from the presence of two or more X chromosomes. 
E)  sex determination is a delicate balance between X and Y chromosomes. 
A)  male characteristics result from the presence of only one X chromosome. 
B)  male characteristics result from the absence of two or more X chromosomes. 
C)  male characteristics result from the minimal presence of one Y chromosome. 
D)  female characteristics result from the presence of two or more X chromosomes. 
E)  sex determination is a delicate balance between X and Y chromosomes.

Question 18

Which genetic disorder is the result of a deletion of a section of an individual's chromosome?

Accepted Answer

A)  Williams syndrome 
B)  Klinefelter syndrome 
C)  Down syndrome 
D)  Turner syndrome 
E)  None of the answer choices is the result of a deletion of a section of an individual's chromosome. 
A)  Williams syndrome 
B)  Klinefelter syndrome 
C)  Down syndrome 
D)  Turner syndrome 
E)  None of the answer choices is the result of a deletion of a section of an individual's chromosome.

Question 19

Which statement about Down syndrome is correct?

Accepted Answer

A)  Down syndrome is caused by a third copy of chromosome 21. 
B)  Down syndrome is usually associated with chromosomal nondisjunction in meiosis. 
C)  Characteristics of Down syndrome include stubby fingers and a palm crease. 
D)  Individuals affected with Down syndrome display mental impairment. 
E)  All of the answer choices are correct about Down syndrome. 
A)  Down syndrome is caused by a third copy of chromosome 21. 
B)  Down syndrome is usually associated with chromosomal nondisjunction in meiosis. 
C)  Characteristics of Down syndrome include stubby fingers and a palm crease. 
D)  Individuals affected with Down syndrome display mental impairment. 
E)  All of the answer choices are correct about Down syndrome.

Question 20

Which refers to the loss of a complete chromosome?

Accepted Answer

A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy 
A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy

Exam 24: Chromosomal Basis of Inheritance

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

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

Karyotyping can be used to diagnose which of the following genetic disorders?

Which of the following is a condition in which a person inherits an extra copy of a chromosome?

During meiosis, what process can sometimes "unlink" genes?

Which of the following conditions is due to a sex-linked gene?

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?

The most common autosomal abnormality seen among humans is

Down syndrome

Which refers to the addition of a repeat segment of a chromosome?

In which way would males and females differ in terms of chromosomes?

Genes that are linked do not show independent assortment.

The chances of survival are greater when trisomy or monosomy involves the sex chromosomes.

Which of the following sex-linked diseases is characterized by a waddling gait, toe walking, frequent falls, and difficulty in rising, and may appear as soon as the child starts to walk?

The location of a gene on a chromosome is called

An individual who has an XXY combination of sex chromosomes is said to have

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

Which genetic disorder is the result of a deletion of a section of an individual's chromosome?

Which statement about Down syndrome is correct?

Which refers to the loss of a complete chromosome?

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