Question 1

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 2

When describing people as "lactose intolerant," you are describing

Accepted Answer

A)  their genotype. 
B)  their phenotype. 
C)  their alleles. 
D)  their genome. 
E)  none of these 
A)  their genotype. 
B)  their phenotype. 
C)  their alleles. 
D)  their genome. 
E)  none of these

Question 3

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 4

Describe the term "polygenic traits."

Accepted Answer

Polygenic traits are governed by several

Question 5

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 6

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. In an autosomal recessive disorder, heterozygotes have an unaffected phenotype. 
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. In an autosomal recessive disorder, heterozygotes have an unaffected phenotype.

Question 7

Which of the following X-linked recessive disorders is characterized by a degeneration of the muscles?

Accepted Answer

A)  Fragile X 
B)  Duchenne 
C)  color blindness 
D)  hemophilia 
E)  malaria 
A)  Fragile X 
B)  Duchenne 
C)  color blindness 
D)  hemophilia 
E)  malaria

Question 8

Is it possible for a man with type O blood to be the father of a child with type A blood?

Accepted Answer

A) True 
 B)False

Question 9

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 10

Can two parents that have a genetic disorder ever have a normal child?

Accepted Answer

A) True 
 B)False

Question 11

When you describe a person as having attached ear lobes,you are describing his or her genotype.

Accepted Answer

A) True 
 B)False

Question 12

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 13

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 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

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.

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Most of the sex-linked traits are found only on the X chromosome.

Accepted Answer

A) True 
 B)False

Question 18

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 19

Which of the following disorders is a trinucleotide repeat disorder?

Accepted Answer

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

Question 20

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

Exam 21: Patterns of Genetic Inheritance

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

When describing people as "lactose intolerant," you are describing

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

Describe the term "polygenic traits."

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

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

Which of the following X-linked recessive disorders is characterized by a degeneration of the muscles?

Is it possible for a man with type O blood to be the father of a child with type A blood?

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

Can two parents that have a genetic disorder ever have a normal child?

When you describe a person as having attached ear lobes,you are describing his or her genotype.

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?

Which of the following genotypes is heterozygous?

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

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

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

Most of the sex-linked traits are found only on the X chromosome.

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

Which of the following disorders is a trinucleotide repeat disorder?

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

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