Question 1

The following figure contains a pedigree for cystic fibrosis,an autosomal recessive disorder.Which of the following is true?

Accepted Answer

A)  At least two of the members of Generation I are carriers of cystic fibrosis. 
B)  None of the members of Generation II is a carrier of cystic fibrosis. 
C)  Individual 2 in Generation II has cystic fibrosis. 
D)  The cystic fibrosis gene is found on a sex chromosome. 
A)  At least two of the members of Generation I are carriers of cystic fibrosis. 
B)  None of the members of Generation II is a carrier of cystic fibrosis. 
C)  Individual 2 in Generation II has cystic fibrosis. 
D)  The cystic fibrosis gene is found on a sex chromosome.

Question 2

A man is a carrier for a recessive disease allele.A woman is not a carrier and does not have the disease.The couple has four children and

Accepted Answer

A)  none of the children have the disease. 
B)  one of the children has the disease. 
C)  two of the children have the disease. 
D)  all of the male children have the disease. 
A)  none of the children have the disease. 
B)  one of the children has the disease. 
C)  two of the children have the disease. 
D)  all of the male children have the disease.

Question 3

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.

Question 4

Down syndrome results from trisomy of chromosome 21.Which of the following is NOT an example of how this may have happened?

Accepted Answer

A)  translocation of chromosome 21 
B)  failure of the homologous pair for chromosome 21 to separate in meiosis I 
C)  inversion of a portion of chromosome 21 during S phase 
D)  failure of the sister chromatids in a duplicated chromosome 21 to separate in meiosis II 
A)  translocation of chromosome 21 
B)  failure of the homologous pair for chromosome 21 to separate in meiosis I 
C)  inversion of a portion of chromosome 21 during S phase 
D)  failure of the sister chromatids in a duplicated chromosome 21 to separate in meiosis II

Question 5

The following diagram demonstrates what happens during a change in chromosomal structure known as a deletion.

Accepted Answer

A) True 
 B)False

Question 6

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 7

The chromosome theory of inheritance states that

Accepted Answer

A)  chromosomes are made of DNA. 
B)  genes are located on chromosomes. 
C)  genes are inherited. 
D)  patterns of inheritance are based on probability. 
A)  chromosomes are made of DNA. 
B)  genes are located on chromosomes. 
C)  genes are inherited. 
D)  patterns of inheritance are based on probability.

Question 8

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 9

During cell division,a piece of a chromosome breaks away and is added to the end of its homologue.The homologue with the addition is an example of

Accepted Answer

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

Question 10

Two chromosomes that have the same set of genes,but perhaps different versions of those genes,are called ________ chromosomes.

Accepted Answer

The answer of Two chromosomes that have the same set...

Question 11

The tendency to develop diseases,such as cancer and heart disease,is

Accepted Answer

A)  usually the result of a mutation in one gene. 
B)  the result of new combinations of alleles formed during meiosis. 
C)  the result of the interaction of multiple genes and environmental factors. 
D)  the result of multiple mutations caused by crossing-over. 
A)  usually the result of a mutation in one gene. 
B)  the result of new combinations of alleles formed during meiosis. 
C)  the result of the interaction of multiple genes and environmental factors. 
D)  the result of multiple mutations caused by crossing-over.

Question 12

Many experiments have been performed on humans to study the inheritance of genetic traits through generations.

Accepted Answer

A) True 
 B)False

Question 13

The ________ gene is responsible for activating many genes involved in "maleness" during embryonic development.

Accepted Answer

The answer of The ________ gene is responsible for activating...

Question 14

All sex-linked genes are either X-linked or ________-linked.

Accepted Answer

The answer of All sex-linked genes are either X-linked or...

Question 15

Because an individual with an XX genotype is a female,is an individual with an XO (no second sex chromosome)a male?

Accepted Answer

A)  No, because the X always overrides the Y and makes that embryo female. 
B)  No, because the Y chromosome contains the gene that makes an embryo male. 
C)  Yes, because if there is only one X, the embryo cannot become female. 
D)  Yes, because all embryos start off as males. 
A)  No, because the X always overrides the Y and makes that embryo female. 
B)  No, because the Y chromosome contains the gene that makes an embryo male. 
C)  Yes, because if there is only one X, the embryo cannot become female. 
D)  Yes, because all embryos start off as males.

Question 16

Which of the following processes is NOT a method of generating new combinations of alleles in the offspring of two individuals?

Accepted Answer

A)  crossing-over between chromosomes 
B)  fertilization of an egg by a sperm 
C)  independent assortment of chromosomes 
D)  linkage of genes 
A)  crossing-over between chromosomes 
B)  fertilization of an egg by a sperm 
C)  independent assortment of chromosomes 
D)  linkage of genes

Question 17

A woman who is a carrier for a recessive X-linked disorder has children with a man who does not have the disease.Which of the following is true of the couple's children?

Accepted Answer

A)  All of their daughters will be carriers. 
B)  Their sons have a 50 percent chance of being carriers. 
C)  Their sons have a 50 percent chance of having the disorder. 
D)  Their daughters have a 50 percent chance of having the disorder. 
A)  All of their daughters will be carriers. 
B)  Their sons have a 50 percent chance of being carriers. 
C)  Their sons have a 50 percent chance of having the disorder. 
D)  Their daughters have a 50 percent chance of having the disorder.

Exam 10: Chromosomes and Human Genetics

The following figure contains a pedigree for cystic fibrosis,an autosomal recessive disorder.Which of the following is true?

A man is a carrier for a recessive disease allele.A woman is not a carrier and does not have the disease.The couple has four children and

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

Down syndrome results from trisomy of chromosome 21.Which of the following is NOT an example of how this may have happened?

The following diagram demonstrates what happens during a change in chromosomal structure known as a deletion.

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

The chromosome theory of inheritance states that

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.

During cell division,a piece of a chromosome breaks away and is added to the end of its homologue.The homologue with the addition is an example of

Two chromosomes that have the same set of genes,but perhaps different versions of those genes,are called ________ chromosomes.

The tendency to develop diseases,such as cancer and heart disease,is

Many experiments have been performed on humans to study the inheritance of genetic traits through generations.

The ________ gene is responsible for activating many genes involved in "maleness" during embryonic development.

All sex-linked genes are either X-linked or ________-linked.

Because an individual with an XX genotype is a female,is an individual with an XO (no second sex chromosome)a male?

Which of the following processes is NOT a method of generating new combinations of alleles in the offspring of two individuals?

A woman who is a carrier for a recessive X-linked disorder has children with a man who does not have the disease.Which of the following is true of the couple's children?

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photo Synthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

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Animal Behavior

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