Question 1

Can a woman with an X-linked recessive disorder have normal sons?

Accepted Answer

The answer of Can a woman with an X-linked recessive...

Question 2

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 E)
G) A) and D)

Question 3

Which of the following is an example of a recessive genotype?

Accepted Answer

A)   aa
B)   Aa
C)   short
D)   AA
E)   abF) B) and C)
G) B) and D)

Question 4

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 diseaseF) B) and E)
G) B) and D)

Question 5

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

Accepted Answer

A) True 
 B)False

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 be?

Accepted Answer

A)   blue
B)   yellow
C)   green
D)   blue and yellow striped
E)   whiteF) B) and C)
G) C) and D)

Question 7

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 8

Julie has a genetic disorder. Julie and her husband, Shane, have three children, none of which have the genetic disorder. How is this disorder most likely inherited?

Accepted Answer

A)   autosomal dominant.
B)   autosomal recessive.
C)   heterozygous dominant.
D)   The environment influences the trait instead of the genetics.
E)   100% inheritance from the father since the children are not affected.F) A) and C)
G) A) and E)

Question 9

Which of the following represents the genotype of a male who is color-blind?

Accepted Answer

A)   XBXB
B)   XBXb
C)   XbXb
D)   XbY
E)   XBYF) D) and E)
G) B) and E)

Question 10

What is the genotype of a person with type O blood?

Accepted Answer

A)   IAIA
B)   IAIB
C)   IAi
D)   IBi
E)   iiF) A) and B)
G) C) and D)

Question 11

Which of the following individuals has a recessive phenotype?

Accepted Answer

A)   AA
B)   Aa
C)   AaBb
D)   aabb
E)   aAbBF) C) and E)
G) A) and E)

Question 12

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 RRF) None of the above
G) A) and E)

Question 13

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

Accepted Answer

A)   A
B)   b
C)   AA
D)   Aa
E)   bbF) B) and E)
G) A) and B)

Question 14

There are two different alleles for the number of fingers on the hands: 5 finger allele and 6 finger allele. When both the 5 finger allele and the 6 finger allele are present in the same individual, the individual has 6 fingers on the hands. Which allele is dominant?

Accepted Answer

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

Question 15

Which variable has the stronger influence on the color of an individuals skin?

Accepted Answer

A)   the individuals phenotype
B)   the amount of time spent in the sun
C)   the amount of time spent in the sun and the individuals genotype
D)   the individuals genotype
E)   neither the sun nor the individuals genotype have any influence on the individuals skin colorF) B) and D)
G) B) and C)

Question 16

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 unafected parents will not have affected children.F) B) and D)
G) All of the above

Question 17

If an individual has the A blood type, how many different genotypes can they possess?

Accepted Answer

A)   one
B)   two
C)   three
D)   four
E)   fiveF) B) and D)
G) A) and C)

Question 18

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 19

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

Accepted Answer

A) True 
 B)False

Question 20

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)   2F) B) and E)
G) A) and E)

Exam 20: Patterns of Genetic Inheritance

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

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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 be?

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Which of the following disorders is a trinucleotide repeat disorder?

Correct AnswerverifiedShow Answer

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

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Which of the following is an example of a recessive genotype?

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If an individual has the A blood type, how many different genotypes can they possess?

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There are two different alleles for the number of fingers on the hands: 5 finger allele and 6 finger allele. When both the 5 finger allele and the 6 finger allele are present in the same individual, the individual has 6 fingers on the hands. Which allele is dominant?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following represents the genotype of a male who is color-blind?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following individuals has a recessive phenotype?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which variable has the stronger influence on the color of an individuals skin?

Correct AnswerverifiedShow Answer

Julie has a genetic disorder. Julie and her husband, Shane, have three children, none of which have the genetic disorder. How is this disorder most likely inherited?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the genotype of a person with type O blood?

Correct AnswerverifiedShow Answer

Can a woman with an X-linked recessive disorder have normal sons?

Correct AnswerverifiedShow Answer

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