Question 1

Why are X-linked traits more commonly expressed in males?

Accepted Answer

A)  There is no masking of an affected X allele with a normal X in males. 
B)  Females must have two copies of the affected allele to display a phenotype. 
C)  Females may be unknowing carriers and pass on the trait to male progeny. 
D)  Males only have one X chromosome. 
E)  All of the above. 
A)  There is no masking of an affected X allele with a normal X in males. 
B)  Females must have two copies of the affected allele to display a phenotype. 
C)  Females may be unknowing carriers and pass on the trait to male progeny. 
D)  Males only have one X chromosome. 
E)  All of the above. E

Question 2

Hair texture is an example of incomplete dominance.A person who is homozygous dominant for the H gene has curly hair.What genotype would someone with wavy hair have?

Accepted Answer

A)  HH 
B)  hh 
C)  HHhh 
D)  Hh 
E)  HHHH 
A)  HH 
B)  hh 
C)  HHhh 
D)  Hh 
E)  HHHH D

Question 3

You have a patient who needs a lot of blood.The patient is blood type A-.How many different types of blood can this patient accept?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  8 
A)  1 
B)  2 
C)  3 
D)  4 
E)  8 B

Question 4

The term autosome refers to

Accepted Answer

A)  all chromosomes,including the X and Y. 
B)  all chromosomes,except the X and Y. 
C)  all chromosomes,including the X but not the Y. 
D)  all chromosomes,including the Y but not the X. 
E)  only the X and Y chromosomes. 
A)  all chromosomes,including the X and Y. 
B)  all chromosomes,except the X and Y. 
C)  all chromosomes,including the X but not the Y. 
D)  all chromosomes,including the Y but not the X. 
E)  only the X and Y chromosomes.

Question 5

How much wavy protein is expressed in people with curly hair,compared with people with wavy hair?

Accepted Answer

A)  twice as much 
B)  a single amount 
C)  half the amount 
D)  four times as much 
E)  none 
A)  twice as much 
B)  a single amount 
C)  half the amount 
D)  four times as much 
E)  none

Question 6

Hair texture is an example of incomplete dominance.A person who is homozygous dominant HH has curly hair,and they mate with a person who has straight hair (homozygous recessive hh).What percentage of their offspring will have straight hair? (Draw a Punnett square to help you figure this out. )

Accepted Answer

A)  0% 
B)  25% 
C)  50% 
D)  75% 
E)  100% 
A)  0% 
B)  25% 
C)  50% 
D)  75% 
E)  100%

Question 7

A patient with an O blood type can receive a transfusion from a donor with blood type _______ only.

Accepted Answer

A)  AB 
B)  O 
C)  AB,A,or O 
D)  AB,A,B,or O 
E)  AB,A,or B 
A)  AB 
B)  O 
C)  AB,A,or O 
D)  AB,A,B,or O 
E)  AB,A,or B

Question 8

If we drew a graph for a trait exhibiting polygenic inheritance,the graph would be

Accepted Answer

A)  a straight line. 
B)  a bell curve. 
C)  J-shaped. 
D)  S-shaped. 
E)  U-shaped. 
A)  a straight line. 
B)  a bell curve. 
C)  J-shaped. 
D)  S-shaped. 
E)  U-shaped.

Question 9

A person with the AB blood type expresses which markers on their red blood cell surface?

Accepted Answer

A)  only A 
B)  only B 
C)  A and B 
D)  They have no markers on their cell surface. 
E)  They have A,B,and O markers on their cell surface. 
A)  only A 
B)  only B 
C)  A and B 
D)  They have no markers on their cell surface. 
E)  They have A,B,and O markers on their cell surface.

Question 10

What are X-linked traits?

Accepted Answer

A)  Diseases or phenotypes that are determined by genes on an X chromosome. 
B)  Traits that only affect females because females have two X chromosomes. 
C)  Dominant traits located on X chromosomes. 
D)  Genes that are more likely to have an effect in males than females. 
E)  A and D 
A)  Diseases or phenotypes that are determined by genes on an X chromosome. 
B)  Traits that only affect females because females have two X chromosomes. 
C)  Dominant traits located on X chromosomes. 
D)  Genes that are more likely to have an effect in males than females. 
E)  A and D

Question 11

A pedigree chart reveals the presence of a disease trait in both a boy and his mother's father.This pattern would suggest

Accepted Answer

A)  autosomal recessive inheritance. 
B)  autosomal dominant inheritance. 
C)  X-linked inheritance. 
D)  Y-linked inheritance. 
E)  no inheritance pattern. 
A)  autosomal recessive inheritance. 
B)  autosomal dominant inheritance. 
C)  X-linked inheritance. 
D)  Y-linked inheritance. 
E)  no inheritance pattern.

Question 12

You have a patient who needs a lot of blood.The patient is blood type A+.How many types of blood can this patient accept?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  8 
A)  1 
B)  2 
C)  3 
D)  4 
E)  8

Question 13

Why is type O Rh-negative the "universal donor"?

Accepted Answer

A)  No surface markers are present on the O Rh-negative blood cells to react with the recipient's immune system. 
B)  Three surface markers are present on the donor blood cells (A,B,and O)that are recognized as compatible in all recipients. 
C)  Three surface markers are present on the donor blood cells (A,B,and O),which block immune reactions in the recipient. 
D)  The O and Rh surface markers on the donor red blood cells block immune reactions in the recipient. 
E)  More people have type O blood than any other blood type. 
A)  No surface markers are present on the O Rh-negative blood cells to react with the recipient's immune system. 
B)  Three surface markers are present on the donor blood cells (A,B,and O)that are recognized as compatible in all recipients. 
C)  Three surface markers are present on the donor blood cells (A,B,and O),which block immune reactions in the recipient. 
D)  The O and Rh surface markers on the donor red blood cells block immune reactions in the recipient. 
E)  More people have type O blood than any other blood type.

Question 14

Familial hypercholesterolemia is an example of

Accepted Answer

A)  multifactorial inheritance. 
B)  codominance. 
C)  incomplete dominance. 
D)  a single gene affecting many traits. 
E)  many genes affecting one trait. 
A)  multifactorial inheritance. 
B)  codominance. 
C)  incomplete dominance. 
D)  a single gene affecting many traits. 
E)  many genes affecting one trait.

Question 15

Which of the following best describes blood type O negative?

Accepted Answer

A)  It is the universal recipient. 
B)  It is the universal donor. 
C)  It is the least common blood group. 
D)  It is the most common blood group. 
E)  It has the most surface markers. 
A)  It is the universal recipient. 
B)  It is the universal donor. 
C)  It is the least common blood group. 
D)  It is the most common blood group. 
E)  It has the most surface markers.

Question 16

If a man has an X-linked recessive disease,can his sons inherit that disease from him?

Accepted Answer

A)  Yes,all his sons have one X chromosome. 
B)  No,all his sons inherit their X chromosomes maternally. 
C)  Yes,all his sons inherit their Y chromosomes maternally. 
D)  No,all his sons have one X chromosome. 
E)  Yes,all his sons inherit their X chromosomes maternally. 
A)  Yes,all his sons have one X chromosome. 
B)  No,all his sons inherit their X chromosomes maternally. 
C)  Yes,all his sons inherit their Y chromosomes maternally. 
D)  No,all his sons have one X chromosome. 
E)  Yes,all his sons inherit their X chromosomes maternally.

Question 17

A person with the AB blood type recognizes which of the following blood types as foreign?

Accepted Answer

A)  only A 
B)  only B 
C)  A and B 
D)  O 
E)  They do not recognize any blood types as foreign. 
A)  only A 
B)  only B 
C)  A and B 
D)  O 
E)  They do not recognize any blood types as foreign.

Question 18

In addition to a genetic component,some human disorders like depression have been linked to

Accepted Answer

A)  diet. 
B)  sleep patterns. 
C)  drug abuse. 
D)  stressful events. 
E)  disease. 
A)  diet. 
B)  sleep patterns. 
C)  drug abuse. 
D)  stressful events. 
E)  disease.

Question 19

Which couple could have a boy with Duchenne muscular dystrophy (DMD)?

Accepted Answer

A)  a male with DMD and a homozygous dominant female 
B)  a male without DMD and a homozygous dominant female 
C)  a male without DMD and a carrier female 
D)  all of these 
E)  none of these 
A)  a male with DMD and a homozygous dominant female 
B)  a male without DMD and a homozygous dominant female 
C)  a male without DMD and a carrier female 
D)  all of these 
E)  none of these

Question 20

Codominance is when

Accepted Answer

A)  one allele masks the effect of the other in the phenotype. 
B)  both alleles contribute equally to the phenotype. 
C)  an intermediate phenotype is expressed in the heterozygote. 
D)  more than one gene contributes to the phenotype. 
E)  the environment contributes to the phenotype. 
A)  one allele masks the effect of the other in the phenotype. 
B)  both alleles contribute equally to the phenotype. 
C)  an intermediate phenotype is expressed in the heterozygote. 
D)  more than one gene contributes to the phenotype. 
E)  the environment contributes to the phenotype.

Exam 12: Complex Inheritance

Why are X-linked traits more commonly expressed in males?

Hair texture is an example of incomplete dominance.A person who is homozygous dominant for the H gene has curly hair.What genotype would someone with wavy hair have?

You have a patient who needs a lot of blood.The patient is blood type A-.How many different types of blood can this patient accept?

The term autosome refers to

How much wavy protein is expressed in people with curly hair,compared with people with wavy hair?

Hair texture is an example of incomplete dominance.A person who is homozygous dominant HH has curly hair,and they mate with a person who has straight hair (homozygous recessive hh).What percentage of their offspring will have straight hair? (Draw a Punnett square to help you figure this out. )

A patient with an O blood type can receive a transfusion from a donor with blood type _______ only.

If we drew a graph for a trait exhibiting polygenic inheritance,the graph would be

A person with the AB blood type expresses which markers on their red blood cell surface?

What are X-linked traits?

A pedigree chart reveals the presence of a disease trait in both a boy and his mother's father.This pattern would suggest

You have a patient who needs a lot of blood.The patient is blood type A+.How many types of blood can this patient accept?

Why is type O Rh-negative the "universal donor"?

Familial hypercholesterolemia is an example of

Which of the following best describes blood type O negative?

If a man has an X-linked recessive disease,can his sons inherit that disease from him?

A person with the AB blood type recognizes which of the following blood types as foreign?

In addition to a genetic component,some human disorders like depression have been linked to

Which couple could have a boy with Duchenne muscular dystrophy (DMD)?

Codominance is when

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