Question 1

The probability of tossing a coin and having it be heads or tails is

Accepted Answer

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

Question 2

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

Accepted Answer

A)  Affected children will usually have unaffected parents. 
B)  Heterozygotes are affected. 
C)  Two affected parents can produce an unaffected child. 
D)  Both males and females are affected with equal frequency. 
E)  Two unaffected parents will not have affected children. 
A)  Affected children will usually have unaffected parents. 
B)  Heterozygotes are affected. 
C)  Two affected parents can produce an unaffected child. 
D)  Both males and females are affected with equal frequency. 
E)  Two unaffected parents will not have affected children.

Question 3

There are two different alleles for the number of fingers on the hands: five-finger allele and six-finger allele. When both the five-finger allele and the six-finger allele are present in the same individual, the individual has six fingers on each hand. Which allele is dominant?

Accepted Answer

A)  5 fingers 
B)  6 fingers 
C)  1 finger 
D)  11 fingers 
E)  7 fingers 
A)  5 fingers 
B)  6 fingers 
C)  1 finger 
D)  11 fingers 
E)  7 fingers

Question 4

Clasp your hands together without thinking about it). Which thumb is on top every time you do this? The dominant phenotype is left thumb on top. If you have the genotype tt, which thumb is on top?

Accepted Answer

A)  left 
B)  right 
C)  left 50% of the time and right 50% of the time 
D)  left 25% of the time and right 75% of the time 
E)  left 75% of the time and right 25% of the time 
A)  left 
B)  right 
C)  left 50% of the time and right 50% of the time 
D)  left 25% of the time and right 75% of the time 
E)  left 75% of the time and right 25% of the time

Question 5

While a locus refers to a unit of heredity, a gene refers to a specific position on a chromosome.

Accepted Answer

A) True 
 B)False

Question 6

In a cross of Ss x Ss, the probability of having a heterozygous genotype is

Accepted Answer

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

Question 7

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 8

Explain the problems associated with the genetic disorder Tay-Sachs.
A. This lysosome is responsible for clearing out the fatty acids that build up in the cells of the brain. The buildup 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, paralysis, and death.

Accepted Answer

Tay-Sachs is an autosomal recessive diso

Question 9

Describe the term "polygenic traits."

Accepted Answer

Polygenic traits are governed by several

Question 10

A male inherits his X-linked allele from his mother.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following designations indicates a sex-linked trait?

Accepted Answer

A)  A 
B)  IA 
C)  XB 
D)  a 
E)  i 
A)  A 
B)  IA 
C)  XB 
D)  a 
E)  i

Question 12

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 13

If two parents who are unaffected have a child that is affected, then the parents are both considered bearers.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following terms refers to the genes of an individual?

Accepted Answer

A)  genotype 
B)  phenotype 
C)  gamete 
D)  probability 
E)  autosomal 
A)  genotype 
B)  phenotype 
C)  gamete 
D)  probability 
E)  autosomal

Question 15

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 16

In an X-linked dominant trait, affected males pass the trait only to daughters.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following represents a gamete with a dominant allele?

Accepted Answer

A)  A 
B)  b 
C)  AA 
D)  Aa 
E)  bb 
A)  A 
B)  b 
C)  AA 
D)  Aa 
E)  bb

Question 18

Which of the following is not an autosomal recessive disorder?

Accepted Answer

A)  Marfan syndrome 
B)  Tay-Sachs disease 
C)  cystic fibrosis 
D)  sickle-cell disease 
E)  All are autosomal recessive disorders. 
A)  Marfan syndrome 
B)  Tay-Sachs disease 
C)  cystic fibrosis 
D)  sickle-cell disease 
E)  All are autosomal recessive disorders.

Question 19

In a dihybrid cross, if the resulting ratios are 1:1:1:1, what are the genotypes of the parents?

Accepted Answer

A)  GgRr x ggrr 
B)  GGRR x ggrr 
C)  GgRr x GgRr 
D)  Gg x Rr 
E)  GG x RR 
A)  GgRr x ggrr 
B)  GGRR x ggrr 
C)  GgRr x GgRr 
D)  Gg x Rr 
E)  GG x RR

Question 20

In a cross of Ff x Ff, the probability of having a dominant phenotype is

Accepted Answer

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

Exam 21: Patterns of Genetic Inheritance

The probability of tossing a coin and having it be heads or tails is

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

There are two different alleles for the number of fingers on the hands: five-finger allele and six-finger allele. When both the five-finger allele and the six-finger allele are present in the same individual, the individual has six fingers on each hand. Which allele is dominant?

Clasp your hands together without thinking about it). Which thumb is on top every time you do this? The dominant phenotype is left thumb on top. If you have the genotype tt, which thumb is on top?

While a locus refers to a unit of heredity, a gene refers to a specific position on a chromosome.

In a cross of Ss x Ss, the probability of having a heterozygous genotype is

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.

Describe the term "polygenic traits."

A male inherits his X-linked allele from his mother.

Which of the following designations indicates a sex-linked trait?

Which of the following traits would not be considered multifactorial?

If two parents who are unaffected have a child that is affected, then the parents are both considered bearers.

Which of the following terms refers to the genes of an individual?

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

In an X-linked dominant trait, affected males pass the trait only to daughters.

Which of the following represents a gamete with a dominant allele?

Which of the following is not an autosomal recessive disorder?

In a dihybrid cross, if the resulting ratios are 1:1:1:1, what are the genotypes of the parents?

In a cross of Ff x Ff, the probability of having a dominant phenotype is

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