Question 1

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 2

Each chromosome is made up of several molecules of DNA.

Accepted Answer

A) True 
 B)False

Question 3

Mutations that cause genetic disorders have been found on all human chromosomes except the _ chromosome.

Accepted Answer

The answer of Mutations that cause genetic disorders have been...

Question 4

Newborns are required by all 50 states to get 29 different genetic tests. What is the benefit of these tests?

Accepted Answer

A)  The test results help insurance companies to determine whether a child is eligible for coverage. 
B)  Knowing about a condition before its symptoms arise allows doctors to take preventative measures. 
C)  Genetic tests can clearly demonstrate whether or not a mother used drugs during pregnancy. 
D)  These genetic tests determine the true paternity (father) of every child born. 
A)  The test results help insurance companies to determine whether a child is eligible for coverage. 
B)  Knowing about a condition before its symptoms arise allows doctors to take preventative measures. 
C)  Genetic tests can clearly demonstrate whether or not a mother used drugs during pregnancy. 
D)  These genetic tests determine the true paternity (father) of every child born.

Question 5

The known human genetic diseases are due to abnormalities located on just a few chromosomes.

Accepted Answer

A) True 
 B)False

Question 6

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn't that allele quickly become extinct in the population?

Accepted Answer

A)  Alleles are never lost from a population. 
B)  The homozygous dominant individuals protect the recessive allele in their genomes. 
C)  The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease. 
D)  The homozygous recessive individuals give their alleles to other individuals before they die from the disease. 
A)  Alleles are never lost from a population. 
B)  The homozygous dominant individuals protect the recessive allele in their genomes. 
C)  The recessive allele is carried in the genome of heterozygotes, who do not suffer from the disease. 
D)  The homozygous recessive individuals give their alleles to other individuals before they die from the disease.

Question 7

"New" chromosomes are generated when homologous chromosomes exchange genetic material during ___________.

Accepted Answer

The answer of "New" chromosomes are generated when homologous chromosomes...

Question 8

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 9

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 10

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

Accepted Answer

recombinat

Question 11

Ichthyosis is a recessive sex-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. What is the sex of the child? Explain your answer.

Accepted Answer

Based on the information provided, the c

Question 12

The two classes of chromosomes are sex chromosomes and ____________.

Accepted Answer

The answer of The two classes of chromosomes are sex...

Question 13

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 14

Examine the figure below, which shows a pedigree.  
The gene diagrammed here 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 15

Since 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

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 17

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 18

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 19

Which of the following statements is not true with regard to Huntington's 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's 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's disease is located on chromosome 4.

Question 20

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

Exam 11: Chromosomes and Human Genetics

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

Each chromosome is made up of several molecules of DNA.

Mutations that cause genetic disorders have been found on all human chromosomes except the _ chromosome.

Newborns are required by all 50 states to get 29 different genetic tests. What is the benefit of these tests?

The known human genetic diseases are due to abnormalities located on just a few chromosomes.

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce, why doesn't that allele quickly become extinct in the population?

"New" chromosomes are generated when homologous chromosomes exchange genetic material during ___________.

Most inherited human disorders are the result of

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

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

Ichthyosis is a recessive sex-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. What is the sex of the child? Explain your answer.

The two classes of chromosomes are sex chromosomes and ____________.

Inheritance is said to be both stable and variable because

Examine the figure below, which shows a pedigree. The gene diagrammed here is

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

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?

The chromosome theory of inheritance states that

Chromosomes that are not involved in determining gender are known as

Which of the following statements is not true with regard to Huntington's disease?

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

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

Chemical Building Blocks

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Patterns of Inheritance

DNA

From Gene to Protein

Control of Gene Expression

DNA Technology

How Evolution Works

Evolution of Populations

Adaptation and Speciation

The Evolutionary History of Life

Maintaining the Internal Environment

Animal Nutrition and Digestion

Gas Exchange

The Circulatory System

Animal Hormones

The Nervous System

Sensing the Environment

Skeletons, Muscles, and Movement

Defenses against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

The Biosphere

Growth of Populations

Interactions among Organisms

Communities of Organisms

Ecosystems

Global Change

Biodiversity and People

Cancer: Cell Division Out of Control

Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

Feeding a Hungry Planet

Building a Sustainable Society

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