Question 1

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.

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 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 4

A male inherits his X-linked allele from his mother.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is a dominant allele?

Accepted Answer

A)  A 
B)  a 
C)  AA 
D)  ab 
E)  Ab 
A)  A 
B)  a 
C)  AA 
D)  ab 
E)  Ab

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Which of the following represents a dihybrid cross?

Accepted Answer

A)  ff x ff 
B)  Gg x gg 
C)  AAbb x Aabb 
D)  AAbb x aaBB 
E)  Ss x ss 
A)  ff x ff 
B)  Gg x gg 
C)  AAbb x Aabb 
D)  AAbb x aaBB 
E)  Ss x ss

Question 8

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 9

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 10

Dad has a genotype of AaBb.He can produce sperm with how many different genotypes?

Accepted Answer

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

Question 11

Which variable has the stronger influence on the color of an individual's skin?

Accepted Answer

A)  the individual's phenotype 
B)  the amount of time spent in the sun 
C)  the amount of time spent in the sun and the individual's genotype 
D)  the individual's genotype 
E)  Neither the sun nor the individual's genotype have any influence on the individual's skin color. Skin color is due to a combination of an individual's genotype as well as the environmental influence. 
A)  the individual's phenotype 
B)  the amount of time spent in the sun 
C)  the amount of time spent in the sun and the individual's genotype 
D)  the individual's genotype 
E)  Neither the sun nor the individual's genotype have any influence on the individual's skin color. Skin color is due to a combination of an individual's genotype as well as the environmental influence.

Question 12

Clasp your hands together (without thinking about it).Which thumb is on top every time you do this? 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 
C)  left 50% of the time and right 50% of the time 
D)  left 25% of the time and right 75% of the time 
E)  left 75% of the time and right 25% of the time 
A)  left 
B)  right 
C)  left 50% of the time and right 50% of the time 
D)  left 25% of the time and right 75% of the time 
E)  left 75% of the time and right 25% of the time

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 15

Which of the following traits is an X-linked recessive disorder?

Accepted Answer

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

Question 16

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 17

List the genotypic ratios of the cross between a man with O blood type and a woman with heterozygous B blood type.

Accepted Answer

The man's genotype is ii.The w

Question 18

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 19

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

Accepted Answer

A) True 
 B)False

Question 20

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

Exam 21: Patterns of Genetic Inheritance

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

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

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

A male inherits his X-linked allele from his mother.

Which of the following is a dominant allele?

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

Which of the following represents a dihybrid cross?

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?

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

Dad has a genotype of AaBb.He can produce sperm with how many different genotypes?

Which variable has the stronger influence on the color of an individual's skin?

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

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

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

Which of the following traits is an X-linked recessive disorder?

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

List the genotypic ratios of the cross between a man with O blood type and a woman with heterozygous B blood type.

Which of the following individuals has a recessive phenotype?

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

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

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