Question 1

This chromosomal disorder known as Cri du chat syndrome is the result of missing a part of chromosome 5,an example of chromosome

Accepted Answer

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

Question 2

All humans are capable of producing gametes containing different sex chromosomes.

Accepted Answer

A) True 
 B)False

Question 3

Inheritance is said to be both stable and variable because

Accepted Answer

A)  chromosome structure ensures that the DNA sequence of a chromosome never changes but allows offspring to inherit individual chromosomes randomly. 
B)  the process of gamete formation never changes, but the number of chromosomes in a gamete differs in different offspring. 
C)  most of the time, genetic material is transferred with complete accuracy to the next generation while still creating unique individuals. 
D)  each new individual is a mixture of different chromosomes, but the same genes are found on every chromosome in that individual. 
A)  chromosome structure ensures that the DNA sequence of a chromosome never changes but allows offspring to inherit individual chromosomes randomly. 
B)  the process of gamete formation never changes, but the number of chromosomes in a gamete differs in different offspring. 
C)  most of the time, genetic material is transferred with complete accuracy to the next generation while still creating unique individuals. 
D)  each new individual is a mixture of different chromosomes, but the same genes are found on every chromosome in that individual.

Question 4

Scientists are able to determine what alleles are present in your DNA because every gene in a human occupies a specific position or ________ in your chromosomes.

Accepted Answer

The answer of Scientists are able to determine what alleles...

Question 5

Ichthyosis is a recessive X-linked disorder that causes a person's skin to flake off like fish scales.A normal man and a normal woman produce a child with ichthyosis.This child cannot be female.

Accepted Answer

A) True 
 B)False

Question 6

The gene for a certain sex-linked trait is found only on the Y chromosome.If the male parent carries this gene,which of the following statements about the inheritance of that trait is true?

Accepted Answer

A)  The trait will be expressed in 100 percent of the female offspring. 
B)  The trait will be expressed in 50 percent of the female offspring. 
C)  The trait will be expressed in 100 percent of the male offspring. 
D)  The trait will be expressed in 50 percent of the male offspring. 
A)  The trait will be expressed in 100 percent of the female offspring. 
B)  The trait will be expressed in 50 percent of the female offspring. 
C)  The trait will be expressed in 100 percent of the male offspring. 
D)  The trait will be expressed in 50 percent of the male offspring.

Question 7

An allele that appears to "skip generations" is most likely

Accepted Answer

A)  dominant. 
B)  recessive. 
C)  sex-linked. 
D)  autosomal. 
A)  dominant. 
B)  recessive. 
C)  sex-linked. 
D)  autosomal.

Question 8

An XX individual develops as a male.Which of the following statements offers the most likely explanation?

Accepted Answer

A)  This is the usual situation for an XX individual. 
B)  This occurs when the sperm does not contribute any genetic material. 
C)  A piece of a Y chromosome has become attached to one of the X chromosomes. 
D)  This occurs when the egg does not contribute any genetic material. 
A)  This is the usual situation for an XX individual. 
B)  This occurs when the sperm does not contribute any genetic material. 
C)  A piece of a Y chromosome has become attached to one of the X chromosomes. 
D)  This occurs when the egg does not contribute any genetic material.

Question 9

A parent who is a carrier for the recessive autosomal disorder B has the genotype ________.

Accepted Answer

The answer of A parent who is a carrier for...

Question 10

Genes become linked when crossing-over occurs between nonhomologous chromosomes.

Accepted Answer

A) True 
 B)False

Question 11

The X and Y chromosomes are called sex chromosomes while the other chromosomes are called ________.

Accepted Answer

The answer of The X and Y chromosomes are called...

Question 12

Chromosomes that are NOT involved in determining gender are known as

Accepted Answer

A)  autosomes. 
B)  sex chromosomes. 
C)  homologous. 
D)  linked. 
A)  autosomes. 
B)  sex chromosomes. 
C)  homologous. 
D)  linked.

Question 13

One chromosomal abnormality that is usually fatal is

Accepted Answer

A)  a mutation in a gene on the chromosome. 
B)  the exchange of material between homologous chromosomes. 
C)  a change in the number of sex chromosomes. 
D)  the addition of an extra autosomal chromosome. 
A)  a mutation in a gene on the chromosome. 
B)  the exchange of material between homologous chromosomes. 
C)  a change in the number of sex chromosomes. 
D)  the addition of an extra autosomal chromosome.

Question 14

Genes that are located on opposite ends of the same chromosome are

Accepted Answer

A)  not affected by crossing-over. 
B)  affected by crossing-over at the same frequency as genes that are located next to each other on the same chromosome. 
C)  only affected by crossover events that occur between two nonhomologous chromosomes. 
D)  affected by crossing-over so frequently that they may appear to undergo independent assortment. 
A)  not affected by crossing-over. 
B)  affected by crossing-over at the same frequency as genes that are located next to each other on the same chromosome. 
C)  only affected by crossover events that occur between two nonhomologous chromosomes. 
D)  affected by crossing-over so frequently that they may appear to undergo independent assortment.

Question 15

How do genes on autosomes play a role in sex determination?

Accepted Answer

A)  The "master switch" gene for maleness is on an autosome. 
B)  The SRY gene is on an autosome. 
C)  The X and Y chromosomes are autosomes. 
D)  The SRY gene product has an effect on autosomal genes. 
A)  The "master switch" gene for maleness is on an autosome. 
B)  The SRY gene is on an autosome. 
C)  The X and Y chromosomes are autosomes. 
D)  The SRY gene product has an effect on autosomal genes.

Question 16

A female who is a carrier of the sex-linked gene A has the genotype ________.

Accepted Answer

The answer of A female who is a carrier of...

Question 17

Why are X-linked recessive genetic disorders more commonly seen in males?

Accepted Answer

A)  For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which females do not have. 
B)  Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy. 
C)  The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have. 
D)  Females only have X chromosomes, and genes on the X chromosome are not expressed. 
A)  For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which females do not have. 
B)  Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy. 
C)  The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have. 
D)  Females only have X chromosomes, and genes on the X chromosome are not expressed.

Question 18

Most inherited human disorders are the result of

Accepted Answer

A)  recessive mutations of genes located on autosomes. 
B)  recessive mutations of genes located on the X chromosome. 
C)  recessive mutations of genes located on the Y chromosome. 
D)  simultaneous mutations of the same gene on homologous chromosomes. 
A)  recessive mutations of genes located on autosomes. 
B)  recessive mutations of genes located on the X chromosome. 
C)  recessive mutations of genes located on the Y chromosome. 
D)  simultaneous mutations of the same gene on homologous chromosomes.

Question 19

Even though it is deadly,the Huntington disease allele can remain in the population,because

Accepted Answer

A)  the dominant allele sometimes reverts to a recessive form. 
B)  it is sex-linked to the male gamete, and females do not carry the allele. 
C)  people with the disorder often live long enough to reproduce. 
D)  it is autosomal and can be masked by a codominant harmless allele. 
A)  the dominant allele sometimes reverts to a recessive form. 
B)  it is sex-linked to the male gamete, and females do not carry the allele. 
C)  people with the disorder often live long enough to reproduce. 
D)  it is autosomal and can be masked by a codominant harmless allele.

Question 20

Which of the following is true with regard to understanding the results of genetic testing?

Accepted Answer

A)  If the test shows that you have the allele for a genetic disorder, you will, eventually, show symptoms of that disorder. 
B)  If the test shows that you have the allele for a genetic disorder, you may be able to reduce your risk of developing that disorder with lifestyle changes. 
C)  If the test shows that you do not carry the allele for a particular disorder, there is no chance that you will get that disorder. 
D)  Because we know the functions of all the genes in the human genome, genetic tests can give you complete and accurate information regarding your medical health. 
A)  If the test shows that you have the allele for a genetic disorder, you will, eventually, show symptoms of that disorder. 
B)  If the test shows that you have the allele for a genetic disorder, you may be able to reduce your risk of developing that disorder with lifestyle changes. 
C)  If the test shows that you do not carry the allele for a particular disorder, there is no chance that you will get that disorder. 
D)  Because we know the functions of all the genes in the human genome, genetic tests can give you complete and accurate information regarding your medical health.

Exam 10: Chromosomes and Human Genetics

This chromosomal disorder known as Cri du chat syndrome is the result of missing a part of chromosome 5,an example of chromosome

All humans are capable of producing gametes containing different sex chromosomes.

Inheritance is said to be both stable and variable because

Scientists are able to determine what alleles are present in your DNA because every gene in a human occupies a specific position or ________ in your chromosomes.

Ichthyosis is a recessive X-linked disorder that causes a person's skin to flake off like fish scales.A normal man and a normal woman produce a child with ichthyosis.This child cannot be female.

The gene for a certain sex-linked trait is found only on the Y chromosome.If the male parent carries this gene,which of the following statements about the inheritance of that trait is true?

An allele that appears to "skip generations" is most likely

An XX individual develops as a male.Which of the following statements offers the most likely explanation?

A parent who is a carrier for the recessive autosomal disorder B has the genotype ________.

Genes become linked when crossing-over occurs between nonhomologous chromosomes.

The X and Y chromosomes are called sex chromosomes while the other chromosomes are called ________.

Chromosomes that are NOT involved in determining gender are known as

One chromosomal abnormality that is usually fatal is

Genes that are located on opposite ends of the same chromosome are

How do genes on autosomes play a role in sex determination?

A female who is a carrier of the sex-linked gene A has the genotype ________.

Why are X-linked recessive genetic disorders more commonly seen in males?

Most inherited human disorders are the result of

Even though it is deadly,the Huntington disease allele can remain in the population,because

Which of the following is true with regard to understanding the results of genetic testing?

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DNA Technology

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