age 1 of 36
BIO 189 EXAM 4 STUDY GUIDE 2025/2026 COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES || 100% GUARANTEED PASS <RECENT
VERSION>
The genes in each cell type have different promoters and,
therefore, they respond to different regulatory proteins.
.....Answer.....Each cell type contains different regulatory proteins
and, therefore, they express different proteins.
Assays analyzing transcriptional control of gene expression focus
on which of the following characteristics?
relative level of the protein produced
number of copies of the gene in the organism
size of the gene's open reading frame
,age 2 of 36
An alternative version of a gene is called a(n) __________.
.....Answer.....allele
Human blood groups are governed by three alleles, IA, IB, and i.
IA and IB are codominant and i is recessive to both. A man who
has type B blood and a woman who has type A blood could
have children of which of the following phenotypes?
.....Answer.....A, B, AB, or O
theory that describes: the two alleles for a heritable character
segregate (separate from each other) during gamete formation
and end up in different gametes .....Answer.....Mendel's law of
segregation
Huntington's disease is an example of a genetic disorder caused
by __________. .....Answer.....a lethal dominant allele that
afflicts an individual later in life
,age 3 of 36
In humans, height and skin color have continuous variation in the
population because of __________. .....Answer.....polygenic
inheritance
In incomplete dominance, the offspring __________.
.....Answer.....will have an appearance that's intermediate
between those of the two parental types
__________ occurs when a single gene affects the phenotype of
many characters in an individual. .....Answer.....A pleiotropic
effect
Fetal cells may be removed along with fluid from the womb by
a process known as __________. .....Answer.....amniocentesis
In addition to the ABO system, humans have other blood groups,
including the MN system. Individuals who have alleles for both M
, age 4 of 36
and N show __________ for the M and N red blood cell surface
antigens. .....Answer.....codominance
The F1 generation differed from the F2 in Mendel's experiments
in that __________ .....Answer.....all of the F1 showed the
dominant phenotype, but only three-fourths of the F2 did
A family tree that describes traits in families is called a
__________. .....Answer.....pedigree analysis
Pea plants are tall if they have the genotype TT or Tt, and they
are short if they have genotype tt. A tall plant is mated with a
short plant. Which outcome below would indicate that the tall
parent plant was heterozygous? (Ratio) .....Answer.....The ratio of
tall offspring to short offspring is 1:1.
The effect of the environment on a phenotype is referred to as
__________. .....Answer.....multifactorial
BIO 189 EXAM 4 STUDY GUIDE 2025/2026 COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES || 100% GUARANTEED PASS <RECENT
VERSION>
The genes in each cell type have different promoters and,
therefore, they respond to different regulatory proteins.
.....Answer.....Each cell type contains different regulatory proteins
and, therefore, they express different proteins.
Assays analyzing transcriptional control of gene expression focus
on which of the following characteristics?
relative level of the protein produced
number of copies of the gene in the organism
size of the gene's open reading frame
,age 2 of 36
An alternative version of a gene is called a(n) __________.
.....Answer.....allele
Human blood groups are governed by three alleles, IA, IB, and i.
IA and IB are codominant and i is recessive to both. A man who
has type B blood and a woman who has type A blood could
have children of which of the following phenotypes?
.....Answer.....A, B, AB, or O
theory that describes: the two alleles for a heritable character
segregate (separate from each other) during gamete formation
and end up in different gametes .....Answer.....Mendel's law of
segregation
Huntington's disease is an example of a genetic disorder caused
by __________. .....Answer.....a lethal dominant allele that
afflicts an individual later in life
,age 3 of 36
In humans, height and skin color have continuous variation in the
population because of __________. .....Answer.....polygenic
inheritance
In incomplete dominance, the offspring __________.
.....Answer.....will have an appearance that's intermediate
between those of the two parental types
__________ occurs when a single gene affects the phenotype of
many characters in an individual. .....Answer.....A pleiotropic
effect
Fetal cells may be removed along with fluid from the womb by
a process known as __________. .....Answer.....amniocentesis
In addition to the ABO system, humans have other blood groups,
including the MN system. Individuals who have alleles for both M
, age 4 of 36
and N show __________ for the M and N red blood cell surface
antigens. .....Answer.....codominance
The F1 generation differed from the F2 in Mendel's experiments
in that __________ .....Answer.....all of the F1 showed the
dominant phenotype, but only three-fourths of the F2 did
A family tree that describes traits in families is called a
__________. .....Answer.....pedigree analysis
Pea plants are tall if they have the genotype TT or Tt, and they
are short if they have genotype tt. A tall plant is mated with a
short plant. Which outcome below would indicate that the tall
parent plant was heterozygous? (Ratio) .....Answer.....The ratio of
tall offspring to short offspring is 1:1.
The effect of the environment on a phenotype is referred to as
__________. .....Answer.....multifactorial
