Question 1

Which of the following designates a normal human female?

Accepted Answer

A)   XXY
B)   XY
C)   XX
D)   XYY
E)   XO

Question 2

Karyotype analysis

Accepted Answer

A)   is a means of detecting and reducing mutagenic agents.
B)   is a surgical technique that separates chromosomes that have failed to segregate properly during meiosis II.
C)   can be used in prenatal diagnosis to detect chromosomal mutations and genetic disorders in embryos.
D)   replaces defective alleles with normal ones.
E)   is used in DNA analysis for paternity.

Question 3

Color blindness is an X-linked recessive gene. Two normal-visioned parents produce a color-blind child. 
 (a) Is this child male or female? 
 (b) What are the genotypes of the parents? 
 (c) What are the chances that their next child will be a color-blind daughter?

Accepted Answer

(a) male
(b) Cc x ...

Question 4

If the gene for yellow body color ( y ) is an X-linked recessive and its dominant counterpart ( y +) produces wild body colors, give the phenotypes expected and their frequencies for the following four crosses: 
 (a) yellow female x wild male 
 (b) wild carrier female x wild male 
 (c) wild carrier female x yellow male 
 (d) homozygous wild female x yellow male

Accepted Answer

(a) yellow male, wild female
(b) 1/4 w...

Question 5

Concerning the sex chromosomes, which of the following is correct?

Accepted Answer

A)   The Y chromosome carries a greater number of nonsexual traits.
B)   X and Y are different in size but carry nearly equal numbers of genes.
C)   The X chromosome carries more genes for nonsexual traits.
D)   The X chromosome carries only gender-related genes.
E)   The X chromosome carries the SRY gene.

Question 6

If an embryo doesn't have an exact multiple of the normal haploid number of 23 chromosomes, the condition is known as

Accepted Answer

A)   aneuploidy.
B)   diploidy.
C)   ahaploidy.
D)   multiploidy.
E)   synploidy.

Question 7

A female who is heterozygous for hemophilia will

Accepted Answer

A)   exhibit the condition throughout her life.
B)   suffer from bleeding when severely stressed.
C)   show no signs of the disease at all.
D)   pass the gene on to all of her children.
E)   pass the gene on to only her sons.

Question 8

Genes are

Accepted Answer

A)   located on chromosomes.
B)   inherited in the same way as chromosomes.
C)   arranged in linear sequence on chromosomes.
D)   may be exchanged between homologous chromosomes.
E)   all of these.

Question 9

Aneuploidy would describe all of the following except

Accepted Answer

A)   Turner syndrome.
B)   Klinefelter syndrome.
C)   translocation.
D)   XYY.
E)   Down syndrome.

Question 10

If a human recessive X-linked characteristic occurred with a 10 percent frequency, what would its frequency be in males and females?

Accepted Answer

Males 10 p...

Question 11

Which of the following statements is false?

Accepted Answer

A)   The SRY gene is absent in females.
B)   The SRY gene apparently is the gene that controls the development of male sexuality.
C)   The development of maleness is by default because males lack two X chromosomes.
D)   Genes on an X chromosome are called X-linked.
E)   There is no difference in external genitalia of males or females until four weeks after conception when the genes determining sex begin to be expressed.

Question 12

In Down syndrome,

Accepted Answer

A)   as the age of the mother increases, the chance of the defect occurring in the unborn children increases.
B)   the age of the father usually has an equal influence on the defect.
C)   most embryos abort before complete term.
D)   a person with the defect cannot have a normal child.
E)   80% of trisomic 21 babies are born to women over the age of 40.

Question 13

Tay-Sachs disease is most common among

Accepted Answer

A)   Blacks.
B)   Hispanics.
C)   Asians.
D)   Jewish people of Eastern European descent.
E)   Native Americans.

Question 14

The condition occurring when an organism has a 2 n + 1 chromosome composition is known as

Accepted Answer

A)   monosomy.
B)   trisomy.
C)   diploid.
D)   haploid.
E)   both trisomy and haploid.

Question 15

Tay-Sachs disease

Accepted Answer

A)   is controlled by a simple recessive gene.
B)   is a sex-linked disease more common in males.
C)   occurs only in those individuals that receive two copies of a defective recessive gene.
D)   is the result of the failure of chromosomes to separate so that an individual receives three instead of two chromosomes.
E)   depends on which parent passes the gene to the child.

Question 16

Selecting the Exception Four of the five answers listed below are caused by recessive genes. Select the exception.

Accepted Answer

A)   Huntington's disorder
B)   phenylketonuria
C)   color blindness
D)   hemophilia
E)   albinism

Question 17

A genetically directed deviation from the average is called

Accepted Answer

A)   an abnormality.
B)   a disorder.
C)   a syndrome.
D)   a carrier.
E)   a pedigree.

Question 18

Which of the following designates a normal human male?

Accepted Answer

A)   YY
B)   XX
C)   XY
D)   XO
E)   XYY

Question 19

One of the major symptoms of Marfan syndrome is

Accepted Answer

A)   hypertension.
B)   rupture of the aorta.
C)   retardation.
D)   short stature.
E)   abnormally short arms and legs.

Question 20

In a pedigree chart, a male showing the specific trait being studied is indicated by a

Accepted Answer

A)   darkened square.
B)   clear square.
C)   darkened diamond.
D)   clear triangle.
E)   darkened circle.

Exam 20: Chromosomes and Human Genetics

In Down syndrome,

Correct Answer
verified

One of the major symptoms of Marfan syndrome is

Correct Answer
verified

Tay-Sachs disease is most common among

Correct Answer
verified

Tay-Sachs disease

Correct Answer
verified

The condition occurring when an organism has a 2 n + 1 chromosome composition is known as

Correct Answer
verified

Selecting the Exception Four of the five answers listed below are caused by recessive genes. Select the exception.

Correct Answer
verified

Aneuploidy would describe all of the following except

Correct Answer
verified

Which of the following designates a normal human female?

Correct Answer
verified

Genes are

Correct Answer
verified

Which of the following statements is false?

Correct Answer
verified

Which of the following designates a normal human male?

Correct Answer
verified

In a pedigree chart, a male showing the specific trait being studied is indicated by a

Correct Answer
verified

Correct Answer
verified
(a) yellow male, wild female
(b) 1/4 w...
View Answer

If an embryo doesn't have an exact multiple of the normal haploid number of 23 chromosomes, the condition is known as

Correct Answer
verified

Concerning the sex chromosomes, which of the following is correct?

Correct Answer
verified

A female who is heterozygous for hemophilia will

Correct Answer
verified

A genetically directed deviation from the average is called

Correct Answer
verified

Karyotype analysis

Correct Answer
verified

Color blindness is an X-linked recessive gene. Two normal-visioned parents produce a color-blind child. (a) Is this child male or female? (b) What are the genotypes of the parents? (c) What are the chances that their next child will be a color-blind daughter?

Correct Answer
verified
(a) male
(b) Cc x ...
View Answer

If a human recessive X-linked characteristic occurred with a 10 percent frequency, what would its frequency be in males and females?

Correct Answer
verified
Males 10 p...
View Answer

Exam 20: Chromosomes and Human Genetics

In Down syndrome,

Correct AnswerverifiedShow Answer

One of the major symptoms of Marfan syndrome is

Correct AnswerverifiedShow Answer

Tay-Sachs disease is most common among

Correct AnswerverifiedShow Answer

Tay-Sachs disease

Correct AnswerverifiedShow Answer

The condition occurring when an organism has a 2 n + 1 chromosome composition is known as

Correct AnswerverifiedShow Answer

Selecting the Exception Four of the five answers listed below are caused by recessive genes. Select the exception.

Correct AnswerverifiedShow Answer

Aneuploidy would describe all of the following except

Correct AnswerverifiedShow Answer

Which of the following designates a normal human female?

Correct AnswerverifiedShow Answer

Genes are

Correct AnswerverifiedShow Answer

Which of the following statements is false?

Correct AnswerverifiedShow Answer

Which of the following designates a normal human male?

Correct AnswerverifiedShow Answer

In a pedigree chart, a male showing the specific trait being studied is indicated by a

Correct AnswerverifiedShow Answer

Correct Answerverified(a) yellow male, wild female (b) 1/4 w...View AnswerShow Answer

If an embryo doesn't have an exact multiple of the normal haploid number of 23 chromosomes, the condition is known as

Correct AnswerverifiedShow Answer

Concerning the sex chromosomes, which of the following is correct?

Correct AnswerverifiedShow Answer

A female who is heterozygous for hemophilia will

Correct AnswerverifiedShow Answer

A genetically directed deviation from the average is called

Correct AnswerverifiedShow Answer

Karyotype analysis

Correct AnswerverifiedShow Answer

Color blindness is an X-linked recessive gene. Two normal-visioned parents produce a color-blind child. (a) Is this child male or female? (b) What are the genotypes of the parents? (c) What are the chances that their next child will be a color-blind daughter?

Correct Answerverified(a) male (b) Cc x ...View AnswerShow Answer

If a human recessive X-linked characteristic occurred with a 10 percent frequency, what would its frequency be in males and females?

Correct AnswerverifiedMales 10 p...View AnswerShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified
(a) yellow male, wild female
(b) 1/4 w...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(a) male
(b) Cc x ...
View Answer

Correct Answer
verified
Males 10 p...
View Answer