Question 1

In fruit flies, bar eye is inherited by a dominant X-linked allele (B for bar) . If a heterozygous bar-eyed female is mated to a non-bar-eyed male, what will be the expected ratio of phenotype given four offspring?

Accepted Answer

A)   two bar-eyed females, two bar-eyed males
B)   one bar-eyed and one non-bar-eyed female, one bar-eyed and one non-bar-eyed male
C)   three bar-eyed females and one non-bar-eyed male
D)   bar-eyed females only
E)   non-bar-eyed males only

Question 2

In the following question, the distance between alleles on a chromosome is visualized. Which of the following pairs of alleles would be most likely to cross over?

Accepted Answer

A)   A..........B
B)   A...B......
C)   A......B.......C
D)   AB.............
E)   .........AB

Question 3

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.

Question 4

Which one of the following x-linked disorders is caused by an abnormal number of repeat sequences in the genome and is the most common cause of inherited mental impairment?

Accepted Answer

A)   fragile X syndrome
B)   Klinefelter syndrome
C)   Williams syndrome
D)   cri du chat syndrome
E)   Down syndrome

Question 5

Genes on the same chromosome are more likely to assort independently if

Accepted Answer

A)   they are next to one another.
B)   they are nearby one another.
C)   they are located far apart.
D)   they code for similar traits.
E)   they code for traits that affect the same part of the body.

Question 6

List the possible zygote combinations that could occur if a man has one nondisjunction occur during meiosis II, but the woman's eggs are normal.

Accepted Answer

Two of the zygotes would be normal (2n) ...

Question 7

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.

Question 8

All of the genes on a single chromosome form a

Accepted Answer

A)   locus.
B)   homologous group.
C)   a linkage map.
D)   a linkage group.
E)   information unit.

Question 9

The trait diagrammed in Figure 24.4 is inherited as a(n)

Accepted Answer

A)   dominant X-linked trait.
B)   recessive X-linked trait.
C)   recessive Y-linked trait.
D)   autosomal dominant trait.
E)   dominant Y-linked trait.

Question 10

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

Accepted Answer

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

Question 11

Generally, it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis. However, it is possible to assert that XYY results from nondisjunction during

Accepted Answer

A)   oogenesis.
B)   spermatogenesis.
C)   mitosis.
D)   cytokinesis.

Question 12

In Down syndrome, the Dart gene causes mental impairment by increasing the levels of pyrimidines in the blood.

Accepted Answer

A) True 
 B)False

Question 13

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.

Question 14

List and describe the four X-linked recessive disorders.

Accepted Answer

1. Color-blindness results in color visi...

Question 15

Genes on which chromosome determine if the sex of a child will be male or female?

Accepted Answer

A)   X
B)   Y
C)   21st
D)   5th
E)   19th

Question 16

If a person has short stature, a fold in the eyelids, fissured tongue, and mental impairment, they have

Accepted Answer

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

Question 17

Which of the following sex-linked disorders was common among the royal families of Europe, and all of the affected males could trace their ancestry to Queen Victoria of England?

Accepted Answer

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

Question 18

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%

Question 19

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

Accepted Answer

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

Question 20

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.

Exam 24: Chromosomal Basis of Inheritance

List and describe the four X-linked recessive disorders.

Correct Answerverified1. Color-blindness results in color visi...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

In the following question, the distance between alleles on a chromosome is visualized. Which of the following pairs of alleles would be most likely to cross over?

Correct AnswerverifiedShow Answer

A person with an XO genotype is classified as having

Correct AnswerverifiedShow Answer

The trait diagrammed in Figure 24.4 is inherited as a(n)

Correct AnswerverifiedShow Answer

List the possible zygote combinations that could occur if a man has one nondisjunction occur during meiosis II, but the woman's eggs are normal.

Correct AnswerverifiedTwo of the zygotes would be normal (2n) ...View AnswerShow Answer

Genes on the same chromosome are more likely to assort independently if

Correct AnswerverifiedShow Answer

In Down syndrome, the Dart gene causes mental impairment by increasing the levels of pyrimidines in the blood.

Correct AnswerverifiedShow Answer

If a person has short stature, a fold in the eyelids, fissured tongue, and mental impairment, they have

Correct AnswerverifiedShow Answer

Which of the following sex-linked disorders was common among the royal families of Europe, and all of the affected males could trace their ancestry to Queen Victoria of England?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Genes on which chromosome determine if the sex of a child will be male or female?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All of the genes on a single chromosome form a

Correct AnswerverifiedShow Answer

In fruit flies, bar eye is inherited by a dominant X-linked allele (B for bar) . If a heterozygous bar-eyed female is mated to a non-bar-eyed male, what will be the expected ratio of phenotype given four offspring?

Correct AnswerverifiedShow Answer

Generally, it is not possible to determine whether nondisjunction failed to occur in oogenesis or spermatogenesis. However, it is possible to assert that XYY results from nondisjunction during

Correct AnswerverifiedShow Answer

Which one of the following x-linked disorders is caused by an abnormal number of repeat sequences in the genome and is the most common cause of inherited mental impairment?

Correct AnswerverifiedShow Answer

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Two of the zygotes would be normal (2n) ...
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