Question 1

If a mother is a carrier for color-blindness and her husband is not color-blind, what are the probable genotypes of the children?

Accepted Answer

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

Question 2

Unattached earlobes are a dominant trait in humans. Which phenotype does an individual with the genotype EE show?

Accepted Answer

A)  Both earlobes are unattached. 
B)  Both earlobes are attached. 
C)  The right earlobe is attached and the left earlobe is unattached. 
D)  The right earlobe is unattached and the left earlobe is attached. 
E)  Both earlobes are extremely elongated. 
A)  Both earlobes are unattached. 
B)  Both earlobes are attached. 
C)  The right earlobe is attached and the left earlobe is unattached. 
D)  The right earlobe is unattached and the left earlobe is attached. 
E)  Both earlobes are extremely elongated. A

Question 3

In a pedigree, an affected male would be designated by

Accepted Answer

A)  an open circle. 
B)  a shaded circle. 
C)  an open square. 
D)  a shaded square. 
E)  a square with a line through it. 
A)  an open circle. 
B)  a shaded circle. 
C)  an open square. 
D)  a shaded square. 
E)  a square with a line through it. D

Question 4

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.

Question 5

It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.

Accepted Answer

A) True 
 B)False

Question 6

If the mother's genotype is aa, all of her eggs will be identical for this trait.

Accepted Answer

A) True 
 B)False

Question 7

An allele is to a gene as a locus is to a

Accepted Answer

A)  gamete. 
B)  phenotype. 
C)  chromosome. 
D)  genotype. 
E)  unit of heredity. 
A)  gamete. 
B)  phenotype. 
C)  chromosome. 
D)  genotype. 
E)  unit of heredity.

Question 8

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

Question 9

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

Accepted Answer

The answer of Can two parents that have a genetic...

Question 10

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 11

The square that is used to make all the possible combinations of gametes is called a Punnett square.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following represents a cross to determine if an individual is homozygous dominant or heterozygous?

Accepted Answer

A)  Aa x aa 
B)  AA x AA 
C)  aa x aa 
D)  Aa x AA 
E)  Aa x Aa 
A)  Aa x aa 
B)  AA x AA 
C)  aa x aa 
D)  Aa x AA 
E)  Aa x Aa

Question 13

There is a single gene that controls the ability to taste PTC paper. The ability to taste is dominant to the inability to taste. If you can taste the paper, it is very bitter. Which of the following genotypes can taste the paper?

Accepted Answer

A)  only PP 
B)  both PP and Pp 
C)  both PP and pp 
D)  only Pp 
E)  only pp 
A)  only PP 
B)  both PP and Pp 
C)  both PP and pp 
D)  only Pp 
E)  only pp

Question 14

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 15

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 16

Which of the following traits/disorders is controlled by multiple genes?

Accepted Answer

A)  skin color 
B)  Tay-Sachs disease 
C)  ABO blood type 
D)  familial hypercholesterolemia 
E)  curly hair 
A)  skin color 
B)  Tay-Sachs disease 
C)  ABO blood type 
D)  familial hypercholesterolemia 
E)  curly hair

Question 17

There is a trait with two alleles. One allele codes for blue while the other allele codes for yellow. If this trait is inherited in a codominant manner, what color will the offspring most likely be?

Accepted Answer

A)  blue 
B)  yellow 
C)  green 
D)  blue-and-yellow striped 
E)  white 
A)  blue 
B)  yellow 
C)  green 
D)  blue-and-yellow striped 
E)  white

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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 20

If a person with type B blood marries a person with type A blood, what phenotypes can their children be?

Accepted Answer

A)  all type A 
B)  all type B 
C)  types A and O 
D)  types B and O 
E)  types A, B, O, and AB 
A)  all type A 
B)  all type B 
C)  types A and O 
D)  types B and O 
E)  types A, B, O, and AB

Exam 21: Patterns of Genetic Inheritance

If a mother is a carrier for color-blindness and her husband is not color-blind, what are the probable genotypes of the children?

Unattached earlobes are a dominant trait in humans. Which phenotype does an individual with the genotype EE show?

In a pedigree, an affected male would be designated by

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

It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.

If the mother's genotype is aa, all of her eggs will be identical for this trait.

An allele is to a gene as a locus is to a

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

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

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

The square that is used to make all the possible combinations of gametes is called a Punnett square.

Which of the following represents a cross to determine if an individual is homozygous dominant or heterozygous?

There is a single gene that controls the ability to taste PTC paper. The ability to taste is dominant to the inability to taste. If you can taste the paper, it is very bitter. Which of the following genotypes can taste the paper?

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

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 traits/disorders is controlled by multiple genes?

There is a trait with two alleles. One allele codes for blue while the other allele codes for yellow. If this trait is inherited in a codominant manner, what color will the offspring most likely be?

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

Which of the following genotypes is heterozygous?

If a person with type B blood marries a person with type A blood, what phenotypes can their children be?

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