HARR BB UPDATED ACTUAL Questions
and CORRECT Answers
Correct Answer: B - CORRECT ANSWER - What type of serological testing does the
blood bank technologist perform when determining the blood group of a patient?
A. Genotyping
B. Phenotyping
C. Both genotyping and phenotyping
D. Polymerase chain reaction
Correct Answer: A - CORRECT ANSWER - If anti-K reacts 3+ with a donor cell with a
genotype KK and 2+ with a Kk cell, the antibody is demonstrating:
A. Dosage
B. Linkage disequilibrium
C. Homozygosity
D. Heterozygosity
Correct Answer: C - CORRECT ANSWER - Carla expresses the blood group antigens
Fya, Fyb, and Xga. James shows expressions of none of these antigens. What factor(s) may
account for the absence of these antigens in James?
A. Gender
B. Race
C. Gender and race
D. Medication
Correct Answer: B - CORRECT ANSWER - Which of the following statements is true?
A. An individual with the BO genotype is homozygous for B antigen
B. An individual with the BB genotype is homozygous for B antigen
C. An individual with the OO genotype is heterozygous for O antigen
,D. An individual with the AB phenotype is homozygous for A and B antigens
Correct Answer: A - CORRECT ANSWER - Which genotype is heterozygous for C?
A. DCe/dce
B. DCE/DCE
C. Dce/dce
D. DCE/dCe
Correct Answer: D - CORRECT ANSWER - Which genotype(s) will give rise to the
Bombay phenotype?
A. HH only
B. HH and Hh
C. Hh and hh
D. hh only
Correct Answer: A - CORRECT ANSWER - Meiosis in cell division is limited to the ova
and sperm producing four gametes containing what complement of DNA?
A. 1N
B. 2N
C. 3N
D. 4N
Correct Answer: A - CORRECT ANSWER - A cell that is not actively dividing is said to
be in:
A. Interphase
B. Prophase
C. Anaphase
D. Telophase
,Correct Answer: C - CORRECT ANSWER - Which of the following describes the
expression of most blood group antigens?
A. Dominant
B. Recessive
C. Codominant
D. Corecessive
Correct Answer: D - CORRECT ANSWER - What blood type is not possible for an
offspring of an AO and BO mating?
A. AB
B. A or B
C. O
D. All are possible
Correct Answer: D - CORRECT ANSWER - The alleged father of a child in a disputed
case of paternity is blood group AB. The mother is group O and the child is group O. What type
of exclusion is this?
A. Direct/primary/first order
B. Probability
C. Random
D. Indirect/secondary/second order
Correct Answer: B - CORRECT ANSWER - If the frequency of gene Y is 0.4 and the
frequency of gene Z is 0.5, one would expect that they should occur together 0.2 (20%) of the
time. In actuality, they are found together 32% of the time. This is an example of:
A. Crossing over
B. Linkage disequilibrium
C. Polymorphism
D. Chimerism
, Correct Answer: B - CORRECT ANSWER - In the Hardy-Weinberg formula, p2
represents:
A. The heterozygous population of one allele
B. The homozygous population of one allele
C. The recessive allele
D. The dominant allele
Correct Answer: C - CORRECT ANSWER - In this type of inheritance, the father carries
the trait on his X chromosome. He has no sons with the trait because he passed his Y
chromosome to his sons; however, all his daughters will express the trait.
A. Autosomal dominant
B. Autosomal recessive
C. X-linked dominant
D. X-linked recessive
Correct Answer: A - CORRECT ANSWER - Why do IgM antibodies, such as those
formed against the ABO antigens, have the ability to directly agglutinate red blood cells (RBCs)
and cause visible agglutination?
A. IgM antibodies are larger molecules and have the ability to bind more antigen
B. IgM antibodies tend to clump together more readily to bind more antigen
C. IgM antibodies are found in greater concentrations than IgG antibodies
D. IgM antibodies are not limited by subclass specificity
Correct Answer: A - CORRECT ANSWER - Which of the following enhancement
mediums decreases the zeta potential, allowing antibody and antigen to come closer together?
A. LISS
B. Polyethylene glycol
C. Polybrene
D. ZZAP
and CORRECT Answers
Correct Answer: B - CORRECT ANSWER - What type of serological testing does the
blood bank technologist perform when determining the blood group of a patient?
A. Genotyping
B. Phenotyping
C. Both genotyping and phenotyping
D. Polymerase chain reaction
Correct Answer: A - CORRECT ANSWER - If anti-K reacts 3+ with a donor cell with a
genotype KK and 2+ with a Kk cell, the antibody is demonstrating:
A. Dosage
B. Linkage disequilibrium
C. Homozygosity
D. Heterozygosity
Correct Answer: C - CORRECT ANSWER - Carla expresses the blood group antigens
Fya, Fyb, and Xga. James shows expressions of none of these antigens. What factor(s) may
account for the absence of these antigens in James?
A. Gender
B. Race
C. Gender and race
D. Medication
Correct Answer: B - CORRECT ANSWER - Which of the following statements is true?
A. An individual with the BO genotype is homozygous for B antigen
B. An individual with the BB genotype is homozygous for B antigen
C. An individual with the OO genotype is heterozygous for O antigen
,D. An individual with the AB phenotype is homozygous for A and B antigens
Correct Answer: A - CORRECT ANSWER - Which genotype is heterozygous for C?
A. DCe/dce
B. DCE/DCE
C. Dce/dce
D. DCE/dCe
Correct Answer: D - CORRECT ANSWER - Which genotype(s) will give rise to the
Bombay phenotype?
A. HH only
B. HH and Hh
C. Hh and hh
D. hh only
Correct Answer: A - CORRECT ANSWER - Meiosis in cell division is limited to the ova
and sperm producing four gametes containing what complement of DNA?
A. 1N
B. 2N
C. 3N
D. 4N
Correct Answer: A - CORRECT ANSWER - A cell that is not actively dividing is said to
be in:
A. Interphase
B. Prophase
C. Anaphase
D. Telophase
,Correct Answer: C - CORRECT ANSWER - Which of the following describes the
expression of most blood group antigens?
A. Dominant
B. Recessive
C. Codominant
D. Corecessive
Correct Answer: D - CORRECT ANSWER - What blood type is not possible for an
offspring of an AO and BO mating?
A. AB
B. A or B
C. O
D. All are possible
Correct Answer: D - CORRECT ANSWER - The alleged father of a child in a disputed
case of paternity is blood group AB. The mother is group O and the child is group O. What type
of exclusion is this?
A. Direct/primary/first order
B. Probability
C. Random
D. Indirect/secondary/second order
Correct Answer: B - CORRECT ANSWER - If the frequency of gene Y is 0.4 and the
frequency of gene Z is 0.5, one would expect that they should occur together 0.2 (20%) of the
time. In actuality, they are found together 32% of the time. This is an example of:
A. Crossing over
B. Linkage disequilibrium
C. Polymorphism
D. Chimerism
, Correct Answer: B - CORRECT ANSWER - In the Hardy-Weinberg formula, p2
represents:
A. The heterozygous population of one allele
B. The homozygous population of one allele
C. The recessive allele
D. The dominant allele
Correct Answer: C - CORRECT ANSWER - In this type of inheritance, the father carries
the trait on his X chromosome. He has no sons with the trait because he passed his Y
chromosome to his sons; however, all his daughters will express the trait.
A. Autosomal dominant
B. Autosomal recessive
C. X-linked dominant
D. X-linked recessive
Correct Answer: A - CORRECT ANSWER - Why do IgM antibodies, such as those
formed against the ABO antigens, have the ability to directly agglutinate red blood cells (RBCs)
and cause visible agglutination?
A. IgM antibodies are larger molecules and have the ability to bind more antigen
B. IgM antibodies tend to clump together more readily to bind more antigen
C. IgM antibodies are found in greater concentrations than IgG antibodies
D. IgM antibodies are not limited by subclass specificity
Correct Answer: A - CORRECT ANSWER - Which of the following enhancement
mediums decreases the zeta potential, allowing antibody and antigen to come closer together?
A. LISS
B. Polyethylene glycol
C. Polybrene
D. ZZAP
