Question 1

Crossing-over is expected to occur infrequently for genes located very close together on the same chromosome.

Accepted Answer

A) True 
 B)False  True

Question 2

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. A

Question 3

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

locus

Question 4

Which of the following genetic changes would NOT be heritable?

Accepted Answer

A)  a mutation in a skin cell 
B)  the loss of a chromosome in a sperm cell 
C)  the addition of a chromosome in an egg cell 
D)  a mutation in a gene in a gamete 
A)  a mutation in a skin cell 
B)  the loss of a chromosome in a sperm cell 
C)  the addition of a chromosome in an egg cell 
D)  a mutation in a gene in a gamete

Question 5

If a genetic disorder is caused by a dominant allele,individuals with which of the following genotypes would be affected by the disorder?

Accepted Answer

A)  AA and aa 
B)  aa and Aa 
C)  AA and Aa 
D)  AA,Aa,and aa 
A)  AA and aa 
B)  aa and Aa 
C)  AA and Aa 
D)  AA,Aa,and aa

Question 6

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.

Question 7

Refer to the following figure depicting fly genetic crosses.Which actual result indicates that the genes for body color and wing length in fruit flies are linked?

Accepted Answer

A)  Four different phenotypes are present in the offspring. 
B)  Parental genotypes are present in the offspring. 
C)  Nonparental genotypes are present in the offspring. 
D)  A low percentage of nonparental genotypes is present in the offspring. 
A)  Four different phenotypes are present in the offspring. 
B)  Parental genotypes are present in the offspring. 
C)  Nonparental genotypes are present in the offspring. 
D)  A low percentage of nonparental genotypes is present in the offspring.

Question 8

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 9

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 10

All genes on the same chromosome are linked.

Accepted Answer

A) True 
 B)False

Question 11

Recessive genetic disorders are quickly eliminated from human populations because people who have them die before they can reproduce.

Accepted Answer

A) True 
 B)False

Question 12

Males with a recessive X-linked allele that causes a disorder do not always show symptoms because they can also carry a dominant allele on their Y chromosome.

Accepted Answer

A) True 
 B)False

Question 13

An individual with a heterozygous genotype who does not express the recessive trait but can pass it along to offspring is called a ________.

Accepted Answer

The answer of An individual with a heterozygous genotype who...

Question 14

The chance that any two siblings will be genetically identical is astronomically small.

Accepted Answer

A) True 
 B)False

Question 15

Because chromosomal alterations such as duplications often affect several genes,they tend to have serious impacts,including slowed growth and mental retardation.

Accepted Answer

A) True 
 B)False

Question 16

The farther apart on the same chromosome that two genes are located,the more likely they are to undergo ________.

Accepted Answer

recombination,crossi

Question 17

Human males have one chromosome that females do not,known as the ________ chromosome.

Accepted Answer

The answer of Human males have one chromosome that females...

Question 18

The gender of a human child determined by the sperm because

Accepted Answer

A)  all sperm contain the SRY gene. 
B)  all eggs contain the SRY gene. 
C)  only eggs may contain the SRY gene. 
D)  only sperm may contain the SRY gene. 
A)  all sperm contain the SRY gene. 
B)  all eggs contain the SRY gene. 
C)  only eggs may contain the SRY gene. 
D)  only sperm may contain the SRY gene.

Question 19

Which of the following statements would be true if the linkage between two traits were complete?

Accepted Answer

A)  Only the parental combinations of phenotypes could appear in the progeny. 
B)  The rules of independent assortment would hold true. 
C)  Combinations of phenotypes different from those seen in the parents would be produced. 
D)  The exchange of genetic material between chromosomes would be frequent. 
A)  Only the parental combinations of phenotypes could appear in the progeny. 
B)  The rules of independent assortment would hold true. 
C)  Combinations of phenotypes different from those seen in the parents would be produced. 
D)  The exchange of genetic material between chromosomes would be frequent.

Question 20

Because two genes are only very rarely separated from each other by crossing-over,it can be concluded that the two genes are

Accepted Answer

A)  close to each other on the same chromosome. 
B)  far apart from each other on the same chromosome 
C)  on two different chromosomes. 
D)  on homologous chromosomes. 
A)  close to each other on the same chromosome. 
B)  far apart from each other on the same chromosome 
C)  on two different chromosomes. 
D)  on homologous chromosomes.

Exam 10: Chromosomes and Human Genetics

Crossing-over is expected to occur infrequently for genes located very close together on the same chromosome.

Most inherited human disorders are the result of

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.

Which of the following genetic changes would NOT be heritable?

If a genetic disorder is caused by a dominant allele,individuals with which of the following genotypes would be affected by the disorder?

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

Refer to the following figure depicting fly genetic crosses.Which actual result indicates that the genes for body color and wing length in fruit flies are linked?

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

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

All genes on the same chromosome are linked.

Recessive genetic disorders are quickly eliminated from human populations because people who have them die before they can reproduce.

Males with a recessive X-linked allele that causes a disorder do not always show symptoms because they can also carry a dominant allele on their Y chromosome.

An individual with a heterozygous genotype who does not express the recessive trait but can pass it along to offspring is called a ________.

The chance that any two siblings will be genetically identical is astronomically small.

Because chromosomal alterations such as duplications often affect several genes,they tend to have serious impacts,including slowed growth and mental retardation.

The farther apart on the same chromosome that two genes are located,the more likely they are to undergo ________.

Human males have one chromosome that females do not,known as the ________ chromosome.

The gender of a human child determined by the sperm because

Which of the following statements would be true if the linkage between two traits were complete?

Because two genes are only very rarely separated from each other by crossing-over,it can be concluded that the two genes are

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