Question 1

If you want to know the probability that tossing two coins will result in a particular outcome (two heads, for example), you use the

Accepted Answer

A)  product rule. 
B)  sum rule. 
C)  punnett rule. 
D)  Bergman's rule. 
E)  genetics rule. 
A)  product rule. 
B)  sum rule. 
C)  punnett rule. 
D)  Bergman's rule. 
E)  genetics rule. A

Question 2

Which of the following is not a characteristic of an X-linked recessive disorder pedigree?

Accepted Answer

A)  An affected son can have normal parents. 
B)  If a female has the trait, her father must also have it. 
C)  The characteristic often skips a generation. 
D)  More females than males are affected. 
E)  If a woman has the characteristic, all of her sons will have it. 
A)  An affected son can have normal parents. 
B)  If a female has the trait, her father must also have it. 
C)  The characteristic often skips a generation. 
D)  More females than males are affected. 
E)  If a woman has the characteristic, all of her sons will have it. D

Question 3

Even though sickle-cell disease is inherited as an autosomal recessive disorder, the heterozygote can express some variation of the recessive phenotype.

Accepted Answer

A) True 
 B)False  True

Question 4

If a mother is a carrier for color-blindness and her husband is not, which of the following children are most likely?

Accepted Answer

A)  1 normal daughter, 1 carrier daughter, 1 normal son, and 1 color-blind son 
B)  2 normal daughters, 1 normal son, and 1 color-blind son 
C)  2 carrier daughters, 1 normal son, and 1 color-blind son 
D)  1 normal daughter, 1 carrier daughter, and 2 normal sons 
E)  1 normal daughter, 1 carrier daughter, and 2 color-blind sons 
A)  1 normal daughter, 1 carrier daughter, 1 normal son, and 1 color-blind son 
B)  2 normal daughters, 1 normal son, and 1 color-blind son 
C)  2 carrier daughters, 1 normal son, and 1 color-blind son 
D)  1 normal daughter, 1 carrier daughter, and 2 normal sons 
E)  1 normal daughter, 1 carrier daughter, and 2 color-blind sons

Question 5

How are Fragile X syndrome and Huntington disease similar?

Accepted Answer

A)  Both exhibit a late onset in life. 
B)  Both are trinucleotide repeat expansion disorders. 
C)  Both affect the muscles and lead to eventual paralysis. 
D)  Both cause autism. 
E)  Both are found only in males. 
A)  Both exhibit a late onset in life. 
B)  Both are trinucleotide repeat expansion disorders. 
C)  Both affect the muscles and lead to eventual paralysis. 
D)  Both cause autism. 
E)  Both are found only in males.

Question 6

Probability calculations in which the word "or" is used involve the product rule.

Accepted Answer

A) True 
 B)False

Question 7

Of the three possible alleles for the ABO blood type, each individual can have how many?

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  none 
E)  half an allele 
A)  one 
B)  two 
C)  three 
D)  none 
E)  half an allele

Question 8

In a cross of a homozygous dominant parent and a homozygous recessive parent, what is the ratio of offspring that will exhibit the recessive phenotype?

Accepted Answer

A)  0. 
B)  1/4. 
C)  1/2. 
D)  3/4. 
E)  1. 
A)  0. 
B)  1/4. 
C)  1/2. 
D)  3/4. 
E)  1.

Question 9

Which of the following genotypes is heterozygous?

Accepted Answer

A)  Aa 
B)  Ab 
C)  aB 
D)  ab 
E)  aa 
A)  Aa 
B)  Ab 
C)  aB 
D)  ab 
E)  aa

Question 10

In a dihybrid cross, in which both parents are heterozygous for both traits, what is the probability that the offspring will exhibit both of the dominant phenotypes?

Accepted Answer

A)  1/16. 
B)  3/16. 
C)  6/16. 
D)  9/16. 
E)  1. 
A)  1/16. 
B)  3/16. 
C)  6/16. 
D)  9/16. 
E)  1.

Question 11

Which of the following is not a characteristic of an autosomal recessive disorder pedigree?

Accepted Answer

A)  Heterozygotes have an affected phenotype. 
B)  Affected children can have unaffected parents. 
C)  Two affected parents will always have affected children. 
D)  Both males and females are affected with equal frequency. 
E)  Affected individuals with homozygous unaffected mates will have unaffected children. 
A)  Heterozygotes have an affected phenotype. 
B)  Affected children can have unaffected parents. 
C)  Two affected parents will always have affected children. 
D)  Both males and females are affected with equal frequency. 
E)  Affected individuals with homozygous unaffected mates will have unaffected children.

Question 12

Which of the following disorders is caused by a defect in the production of an elastic connective tissue protein called fibrillin?

Accepted Answer

A)  cystic fibrosis 
B)  Tay-Sachs disease 
C)  Marfan syndrome 
D)  Huntington disease 
E)  sickle-cell disease 
A)  cystic fibrosis 
B)  Tay-Sachs disease 
C)  Marfan syndrome 
D)  Huntington disease 
E)  sickle-cell disease

Question 13

The definition of a multifactorial trait is one in which more than one set of alleles is involved in which the environment plays no role.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following genetic disorders is due to a lack of the lysosome enzyme hex A?

Accepted Answer

A)  cystic fibrosis 
B)  Tay-Sachs disease 
C)  Huntington disease 
D)  sickle-cell disease 
E)  Marfan syndrome 
A)  cystic fibrosis 
B)  Tay-Sachs disease 
C)  Huntington disease 
D)  sickle-cell disease 
E)  Marfan syndrome

Question 15

Which of the following is a dominant allele?

Accepted Answer

A)  A 
B)  a 
C)  AA 
D)  ab 
E)  Ab 
A)  A 
B)  a 
C)  AA 
D)  ab 
E)  Ab

Question 16

Which of the following traits would not be considered multifactorial?

Accepted Answer

A)  alcoholism 
B)  suicide risk 
C)  cleft lip/palate 
D)  diabetes 
E)  ABO blood type 
A)  alcoholism 
B)  suicide risk 
C)  cleft lip/palate 
D)  diabetes 
E)  ABO blood type

Question 17

Which of the following traits is an X-linked recessive disorder?

Accepted Answer

A)  Color blindness 
B)  Tay-Sachs 
C)  Cystic fibrosis 
D)  Sickle-cell disease 
E)  Marfan syndrome 
A)  Color blindness 
B)  Tay-Sachs 
C)  Cystic fibrosis 
D)  Sickle-cell disease 
E)  Marfan syndrome

Question 18

Explain the problems associated with the genetic disorder Tay-Sachs.
A. This lysosome is responsible for clearing out the fatty acid proteins that build up in the cells of the brain. The build up begins to interfere with proper brain development and growth. This leads to malfunctions in vision, movement, hearing, and overall mental development. The impairment leads to blindness, seizures, and paralysis.

Accepted Answer

Tay-Sachs is an autosomal recessive diso

Question 19

List the genotypic ratios of the cross between a man with O blood type and a woman who is heterozygous B blood type.

Accepted Answer

Man's genotype is ii. The woma

Question 20

Which of the following represents a dihybrid cross?

Accepted Answer

A)  ff x ff 
B)  Gg x gg 
C)  AAbb x Aabb 
D)  AAbb x aaBB 
E)  Ss x ss 
A)  ff x ff 
B)  Gg x gg 
C)  AAbb x Aabb 
D)  AAbb x aaBB 
E)  Ss x ss

Exam 20: Patterns of Genetic Inheritance

If you want to know the probability that tossing two coins will result in a particular outcome (two heads, for example), you use the

Which of the following is not a characteristic of an X-linked recessive disorder pedigree?

Even though sickle-cell disease is inherited as an autosomal recessive disorder, the heterozygote can express some variation of the recessive phenotype.

If a mother is a carrier for color-blindness and her husband is not, which of the following children are most likely?

How are Fragile X syndrome and Huntington disease similar?

Probability calculations in which the word "or" is used involve the product rule.

Of the three possible alleles for the ABO blood type, each individual can have how many?

In a cross of a homozygous dominant parent and a homozygous recessive parent, what is the ratio of offspring that will exhibit the recessive phenotype?

Which of the following genotypes is heterozygous?

In a dihybrid cross, in which both parents are heterozygous for both traits, what is the probability that the offspring will exhibit both of the dominant phenotypes?

Which of the following is not a characteristic of an autosomal recessive disorder pedigree?

Which of the following disorders is caused by a defect in the production of an elastic connective tissue protein called fibrillin?

The definition of a multifactorial trait is one in which more than one set of alleles is involved in which the environment plays no role.

Which of the following genetic disorders is due to a lack of the lysosome enzyme hex A?

Which of the following is a dominant allele?

Which of the following traits would not be considered multifactorial?

Which of the following traits is an X-linked recessive disorder?

List the genotypic ratios of the cross between a man with O blood type and a woman who is heterozygous B blood type.

Which of the following represents a dihybrid cross?

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