Question 1

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 2

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 ppF) A) and D)
G) A) and C)

Question 3

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.F) A) and D)
G) All of the above A

Question 4

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.F) A) and B)
G) B) and C)

Question 5

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 AaF) C) and D)
G) A) and E)

Question 6

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)   whiteF) B) and E)
G) All of the above

Question 7

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 theseF) A) and E)
G) B) and C)

Question 8

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.F) C) and D)
G) A) and B)

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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.F) B) and E)
G) A) and C) D

Question 11

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 12

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.F) B) and E)
G) A) and D)

Question 13

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.F) A) and B)
G) A) and E)

Question 14

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 15

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

Accepted Answer

A) True 
 B)False

Question 16

Which of the following genotypes is heterozygous?

Accepted Answer

A)   Aa
B)   Ab
C)   aB
D)   ab
E)   aaF) All of the above
G) B) and C)

Question 17

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 18

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 ABF) A) and E)
G) A) and D)

Question 19

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 sonsF) B) and D)
G) B) and C) A

Question 20

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 hairF) A) and B)
G) A) and C)

Exam 21: Patterns of Genetic Inheritance

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In a pedigree, an affected male would be designated by

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following genotypes is heterozygous?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

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

Correct AnswerverifiedShow Answer

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D

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A

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