Question 1

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 2

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 3

Which of the following individuals has a recessive phenotype?

Accepted Answer

A)  AA 
B)  Aa 
C)  AaBb 
D)  aabb 
E)  aAbB 
A)  AA 
B)  Aa 
C)  AaBb 
D)  aabb 
E)  aAbB

Question 4

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

Accepted Answer

A)  IAIA 
B)  IAIB 
C)  IAi 
D)  IBi 
E)  ii 
A)  IAIA 
B)  IAIB 
C)  IAi 
D)  IBi 
E)  ii

Question 5

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)  five 
A)  one 
B)  two 
C)  three 
D)  four 
E)  five

Question 6

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 color 
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 color

Question 7

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 8

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 9

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. 
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.

Question 10

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

Question 11

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

Question 12

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 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 15

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)  XBY 
A)  XBXB 
B)  XBXb 
C)  XbXb 
D)  XbY 
E)  XBY

Question 16

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

Accepted Answer

A)  aa 
B)  Aa 
C)  short 
D)  AA 
E)  ab 
A)  aa 
B)  Aa 
C)  short 
D)  AA 
E)  ab

Question 17

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 18

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. 
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.

Question 19

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

Accepted Answer

A) True 
 B)False

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

Exam 20: Patterns of Genetic Inheritance

Which of the following disorders is a trinucleotide repeat disorder?

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

Which of the following individuals has a recessive phenotype?

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

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

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

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

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

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?

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?

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?

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

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

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

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

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

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

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

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