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 B

Question 2

During ______ _______ diagnosis, cells are removed from the early embryo and tested for genetic disorders before being implanted in the uterus.

Accepted Answer

preimplantation genetic

Question 3

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

Accepted Answer

homologous

Question 4

All genes on the same chromosome are linked.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Among children with parents who are both carriers of a Tay-Sachs, an autosomal recessive disorder, chances are that

Accepted Answer

A)  75 percent will be carriers. 
B)  50 percent will die in a few years. 
C)  75 percent will not carry the recessive Tay-Sach's allele. 
D)  50 percent will be carriers. 
A)  75 percent will be carriers. 
B)  50 percent will die in a few years. 
C)  75 percent will not carry the recessive Tay-Sach's allele. 
D)  50 percent will be carriers.

Question 7

If a female carrier of a recessive X-linked gene (genotype XᴬXᵃ) that causes a disorder mates with a normal male (genotype XᴬY),

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 8

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 9

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 10

Which of the following genotypes represents a human female?

Accepted Answer

A)  XY 
B)  XX 
C)  YY 
D)  Zz 
A)  XY 
B)  XX 
C)  YY 
D)  Zz

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

Which of the following combinations of sex chromosomes would most probably have the most serious effects?

Accepted Answer

A)  XXXX 
B)  XXY 
C)  X 
D)  XX 
A)  XXXX 
B)  XXY 
C)  X 
D)  XX

Question 13

This figure shows a pattern of inheritance.  
The disorder shown in the figure

Accepted Answer

A)  is autosomal. 
B)  is sex-linked. 
C)  displays incomplete dominance. 
D)  results from the linkage of A and 
A)  is autosomal. 
B)  is sex-linked. 
C)  displays incomplete dominance. 
D)  results from the linkage of A and

Question 14

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 15

During cell division a piece of a chromosome breaks away and becomes part of its homologue. This is an example of

Accepted Answer

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

Question 16

Even though it is deadly, the Huntington's 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 don't 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 don't 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 17

What is the effect of the independent assortment of chromosomes on the overall variety of individuals produced?

Accepted Answer

A)  It increases the probable variation between individuals. 
B)  It does not affect the probable variation between individuals. 
C)  It decreases the probable variation between individuals. 
D)  It causes excessive crossing-over within the genome. 
A)  It increases the probable variation between individuals. 
B)  It does not affect the probable variation between individuals. 
C)  It decreases the probable variation between individuals. 
D)  It causes excessive crossing-over within the genome.

Question 18

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 19

What effect does gene linkage have on the overall variety of individuals produced?

Accepted Answer

A)  It increases the probable variation between individuals. 
B)  It does not affect the probable variation between individuals. 
C)  It decreases the probable variation between individuals. 
D)  It causes excessive crossing-over within the genome. 
A)  It increases the probable variation between individuals. 
B)  It does not affect the probable variation between individuals. 
C)  It decreases the probable variation between individuals. 
D)  It causes excessive crossing-over within the genome.

Question 20

Both members of a couple are carriers for a recessive disease allele. If the couple has four children, which of the following must be true?

Accepted Answer

A)  One of the children has the disease. 
B)  Two of the children have the disease. 
C)  All of the male children have the disease. 
D)  Fifty percent of the children could be carriers of the disease. 
A)  One of the children has the disease. 
B)  Two of the children have the disease. 
C)  All of the male children have the disease. 
D)  Fifty percent of the children could be carriers of the disease.

Exam 11: 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 _____.

During ______ _______ diagnosis, cells are removed from the early embryo and tested for genetic disorders before being implanted in the uterus.

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

All genes on the same chromosome are linked.

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

Among children with parents who are both carriers of a Tay-Sachs, an autosomal recessive disorder, chances are that

If a female carrier of a recessive X-linked gene (genotype XᴬXᵃ) that causes a disorder mates with a normal male (genotype XᴬY),

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

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?

Which of the following genotypes represents a human female?

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

Which of the following combinations of sex chromosomes would most probably have the most serious effects?

This figure shows a pattern of inheritance. The disorder shown in the figure

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

During cell division a piece of a chromosome breaks away and becomes part of its homologue. This is an example of

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

What is the effect of the independent assortment of chromosomes on the overall variety of individuals produced?

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

What effect does gene linkage have on the overall variety of individuals produced?

Both members of a couple are carriers for a recessive disease allele. If the couple has four children, which of the following must be true?

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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During _ diagnosis, cells are removed from the early embryo and tested for genetic disorders before being implanted in the uterus.