Question 1

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

Accepted Answer

A)  Fragile X 
B)  Duchenne's 
C)  color blindness 
D)  hemophilia 
A)  Fragile X 
B)  Duchenne's 
C)  color blindness 
D)  hemophilia

Question 2

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

Question 3

In a dihybrid cross,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 4

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 
A)  autosomal dominant 
B)  autosomal recessive

Question 5

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 6

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 7

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

Accepted Answer

A)  one 
B)  two 
C)  three 
A)  one 
B)  two 
C)  three

Question 8

Dad has a genotype of AaBb.How many different kinds of sperm can he produce?

Accepted Answer

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

Question 9

Which of the following is not an autosomal recessive disorder?

Accepted Answer

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

Question 10

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 11

Can a man with type O blood be the father of a child with type A blood?

Accepted Answer

YES
Explanation: Yes

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Question 14

How are Fragile X syndrome and Huntington disease similar?

Accepted Answer

A)  Both exhibit a late onset in life. 
B)  Both are trinucleotide repeat expansion disorders. 
C)  Both affect the muscles and lead to eventual paralysis. 
D)  Both cause autism. 
E)  Both are found only in males. 
A)  Both exhibit a late onset in life. 
B)  Both are trinucleotide repeat expansion disorders. 
C)  Both affect the muscles and lead to eventual paralysis. 
D)  Both cause autism. 
E)  Both are found only in males.

Question 15

Which of the following individuals has a recessive phenotype?

Accepted Answer

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

Question 16

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 17

Clasp your hands together (without thinking about it).Which thumb is on top? The dominant phenotype is left thumb on top.If you have the genotype "tt",which thumb is on top?

Accepted Answer

A)  left 
B)  right 
A)  left 
B)  right

Question 18

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

Accepted Answer

NO
Explanation: No, all of her

Question 19

When describing someone as "lactose intolerant",you are describing their

Accepted Answer

A)  genotype. 
B)  phenotype. 
A)  genotype. 
B)  phenotype.

Question 20

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

Exam 20: Patterns of Genetic Inheritance

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

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?

In a dihybrid cross,what is the probability that the offspring will exhibit both of the dominant phenotypes?

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?

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

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

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

Dad has a genotype of AaBb.How many different kinds of sperm can he produce?

Which of the following is not an autosomal recessive disorder?

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

Can a man with type O blood be the father of a child with type A blood?

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

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

How are Fragile X syndrome and Huntington disease similar?

Which of the following individuals has a recessive phenotype?

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

Clasp your hands together (without thinking about it).Which thumb is on top? The dominant phenotype is left thumb on top.If you have the genotype "tt",which thumb is on top?

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

When describing someone as "lactose intolerant",you are describing their

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

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