Question 1

Which of the following statements is NOT true with regard to Huntington disease?

Accepted Answer

A)  The discovery of the gene has led to a test that can identify people who will have the disease before they show symptoms. 
B)  The disease can be traced using pedigrees. 
C)  Now that the gene is known,a cure has been found. 
D)  The gene for Huntington disease is located on chromosome 4. 
A)  The discovery of the gene has led to a test that can identify people who will have the disease before they show symptoms. 
B)  The disease can be traced using pedigrees. 
C)  Now that the gene is known,a cure has been found. 
D)  The gene for Huntington disease is located on chromosome 4.

Question 2

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 3

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 4

A genetically normal human who has a homozygous genotype for a gene locus on the X chromosome

Accepted Answer

A)  must be a male. 
B)  must be a female. 
C)  cannot be a female. 
D)  may be either male or female. 
A)  must be a male. 
B)  must be a female. 
C)  cannot be a female. 
D)  may be either male or female.

Question 5

We now know that the gene for flower color and the gene for seed color are both on chromosome 1 of the pea plants once studied by Mendel.According to Mendel's results,flower color and seed color undergo independent assortment.Which of the following explanations is most likely?

Accepted Answer

A)  Nonhomologous chromosomes containing the two genes underwent crossing-over to create a new "hybrid" chromosome containing both genes. 
B)  During a round of meiosis,the female part of a flower failed to separate a homologous pair,forcing the seed color gene to pair up with the flower color gene. 
C)  Between the time that Mendel studied peas and modern times,one of the genes was translocated onto chromosome 1,so that in modern times,two genes that were once on separate chromosomes are now linked. 
D)  These genes are so far apart on chromosome 1 that they undergo independent assortment. 
A)  Nonhomologous chromosomes containing the two genes underwent crossing-over to create a new "hybrid" chromosome containing both genes. 
B)  During a round of meiosis,the female part of a flower failed to separate a homologous pair,forcing the seed color gene to pair up with the flower color gene. 
C)  Between the time that Mendel studied peas and modern times,one of the genes was translocated onto chromosome 1,so that in modern times,two genes that were once on separate chromosomes are now linked. 
D)  These genes are so far apart on chromosome 1 that they undergo independent assortment.

Question 6

The independent assortment of chromosomes increases the

Accepted Answer

A)  variation between individuals. 
B)  uniformity between individuals. 
C)  the DNA sequences shared by individuals 
D)  the chances of mating between individuals 
A)  variation between individuals. 
B)  uniformity between individuals. 
C)  the DNA sequences shared by individuals 
D)  the chances of mating between individuals

Question 7

Lethal ________ mutations are not eliminated from a population because they can be "hidden" in symptom-free individuals also carrying dominant alleles.

Accepted Answer

The answer of Lethal ________ mutations are not eliminated from...

Question 8

During meiosis,"new" chromosomes are generated when homologous chromosomes exchange genetic material during ________.

Accepted Answer

The answer of During meiosis,"new" chromosomes are generated when homologous...

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

All inherited diseases are the result of mutations of single genes.

Accepted Answer

A) True 
 B)False

Question 11

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 12

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.

Question 13

Sex-linked genes are found on either the X chromosome or the Y chromosome but not both.

Accepted Answer

A) True 
 B)False

Question 14

In humans,which of the following chromosomes would probably carry the fewest genes?

Accepted Answer

A)  the Y chromosome 
B)  chromosome 4 
C)  the X chromosome 
D)  chromosome 14 
A)  the Y chromosome 
B)  chromosome 4 
C)  the X chromosome 
D)  chromosome 14

Question 15

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 16

The genetic disorder followed through this pedigree is

Accepted Answer

A)  recessive and X-linked. 
B)  recessive and not X-linked. 
C)  dominant and X-linked. 
D)  dominant and not X-linked. 
A)  recessive and X-linked. 
B)  recessive and not X-linked. 
C)  dominant and X-linked. 
D)  dominant and not X-linked.

Question 17

Spontaneous abortions are often due to the addition or deletion of whole ________ in the gametes that fused to form the zygote.

Accepted Answer

The answer of Spontaneous abortions are often due to the...

Question 18

The parents in the following figure are carriers of a genetic disorder.Based on the Punnett square,the allele that causes the disorder must

Accepted Answer

A)  be autosomal. 
B)  be sex-linked. 
C)  be incompletely dominant. 
D)  result from the linkage of A and a 
A)  be autosomal. 
B)  be sex-linked. 
C)  be incompletely dominant. 
D)  result from the linkage of A and a

Question 19

Which of the following statements about crossing-over is true?

Accepted Answer

A)  It lowers the likelihood of genetic recombination. 
B)  It disrupts the linkage between genes. 
C)  It results in the production of extra chromosomes. 
D)  It is usually fatal. 
A)  It lowers the likelihood of genetic recombination. 
B)  It disrupts the linkage between genes. 
C)  It results in the production of extra chromosomes. 
D)  It is usually fatal.

Question 20

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.

Exam 10: Chromosomes and Human Genetics

Which of the following statements is NOT true with regard to Huntington disease?

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

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

A genetically normal human who has a homozygous genotype for a gene locus on the X chromosome

We now know that the gene for flower color and the gene for seed color are both on chromosome 1 of the pea plants once studied by Mendel.According to Mendel's results,flower color and seed color undergo independent assortment.Which of the following explanations is most likely?

The independent assortment of chromosomes increases the

Lethal ________ mutations are not eliminated from a population because they can be "hidden" in symptom-free individuals also carrying dominant alleles.

During meiosis,"new" chromosomes are generated when homologous chromosomes exchange genetic material during ________.

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

All inherited diseases are the result of mutations of single genes.

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?

Sex-linked genes are found on either the X chromosome or the Y chromosome but not both.

In humans,which of the following chromosomes would probably carry the fewest genes?

The chromosome theory of inheritance states that

The genetic disorder followed through this pedigree is

Spontaneous abortions are often due to the addition or deletion of whole ________ in the gametes that fused to form the zygote.

The parents in the following figure are carriers of a genetic disorder.Based on the Punnett square,the allele that causes the disorder must

Which of the following statements about crossing-over is true?

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

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

Photosynthesis 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

The Biosphere

Growth of Populations

Animal Behavior

Ecological Communities

Ecosystems

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons,Muscles,and Movement

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

Filters