Bio 181 ASU exam 3 Latest Update 2025-2026
160 Questions and 100% Verified Correct
Answers Guaranteed A+
A dihybrid cross is arranged for two plants with the following genotype:
AaGg x aaGg
A = Almond shaped seed
a = round seed
G = Green seed color
g = yellow seed color
What proportion of the offspring will be Almond-shaped and green?
A. ½ B. 1/8 C. ¼ D. 3/8 - CORRECT ANSWER: D. 3/8
A dihybrid cross is arranged for two plants with the following genotype:
AaGg x aaGg
A = Almond shaped seed
a = round seed
G = Green seed color
g = yellow seed color
What proportion of the offspring will be Almond-shaped and yellow?
A. ½ B. 1/8 C. ¼ D. 3/4 - CORRECT ANSWER: B. 1/8
A dihybrid cross is arranged for two plants with the following genotype:
AaGgbbDd x aaGgBbdd
A = Almond shaped seed
a = round seed
,G = Green seed color
g = yellow seed color
B= Bright seed coat
b= dull seed coat
D= Durable seed coat
d =fragile seed coat
What proportion of the offspring will be round-shaped, Green, dull, and fragile ?
A. 3/32 B. 9/64 C. ¼ D. 8/64 - CORRECT ANSWER: A. 3/32
A mutant strain of E. coli is found that produces both β-galactosidase and permease
constitutively. What are the MOST likely mutations in this strain? (Select all that apply:
hint** There are two correct answers.)
A) lacOc
B) lacI-
C) lacP-
D) mutation in CRP-cAMP binding site
E) lacZ- and lacY- - CORRECT ANSWER: A) lacOc
B) lacI-
A mutation that changes one amino acid codon into another codon (but not a stop
codon)
A) Nonsense
B) Missense - CORRECT ANSWER: B) Missense
A mutation that results in a stop codon where before there was a normal amino acid is
called...
A. Missense mutation
,B. Nonsense mutation
C. Synonymous mutation
D. Conservative mutation - CORRECT ANSWER: B. Nonsense mutation
A mutation that you could not pass on to your offspring would occur in the
A) germ cells
B) somatic cells - CORRECT ANSWER: B) somatic cells
A purple-flowered pea plant of unknown genotype is crossed with a white-flowered pea
plant. Half of the offspring have white flowers. What is the genotype of the purple-
flowered parent?
A)AA
B)Aa
C)aa
D)No basis to decide - CORRECT ANSWER: B)Aa
A single gene can produce different proteins.
A) true
B) false - CORRECT ANSWER: A) true
A testcross involves crossing with a(n) _____ individual and is used to determine the
_____ of the tested parent.
A) homozygous dominant; phenotype
B) homozygous recessive; phenotype
C) homozygous dominant; genotype
D) homozygous recessive; genotype
E) F2 offspring; parental genotype - CORRECT ANSWER: D) homozygous recessive;
genotype
, A woman who has five children (all boys) is planning to have another child. What is the
probability that this child will be a boy?
A) 1/2
B) 1/64
C) 1/32
D) 6/256 - CORRECT ANSWER: A) 1/2
A woman you know has five children - all of whom are boys. What is the probability for a
woman to have five boys out of five children?
A) 1/4
B) 1/8
C) 1/32
D) 1/64 - CORRECT ANSWER: C) 1/32
AaBbCc x aabbcc, What proportion of offspring have the same genotype as first parent?
A) 1/4
B) 1/8
C) 1/16
D) 1/32 - CORRECT ANSWER: B) 1/8
An operon is a:
A) gene coding for a repressor protein.
B) region of DNA consisting of the promoter, the operator, and coding sequences for
structural proteins.
C) region of DNA consisting of the operator and coding sequences for structural
proteins.
D) region of DNA consisting of the promoter and operator sequences needed to
regulate one or more structural genes.
160 Questions and 100% Verified Correct
Answers Guaranteed A+
A dihybrid cross is arranged for two plants with the following genotype:
AaGg x aaGg
A = Almond shaped seed
a = round seed
G = Green seed color
g = yellow seed color
What proportion of the offspring will be Almond-shaped and green?
A. ½ B. 1/8 C. ¼ D. 3/8 - CORRECT ANSWER: D. 3/8
A dihybrid cross is arranged for two plants with the following genotype:
AaGg x aaGg
A = Almond shaped seed
a = round seed
G = Green seed color
g = yellow seed color
What proportion of the offspring will be Almond-shaped and yellow?
A. ½ B. 1/8 C. ¼ D. 3/4 - CORRECT ANSWER: B. 1/8
A dihybrid cross is arranged for two plants with the following genotype:
AaGgbbDd x aaGgBbdd
A = Almond shaped seed
a = round seed
,G = Green seed color
g = yellow seed color
B= Bright seed coat
b= dull seed coat
D= Durable seed coat
d =fragile seed coat
What proportion of the offspring will be round-shaped, Green, dull, and fragile ?
A. 3/32 B. 9/64 C. ¼ D. 8/64 - CORRECT ANSWER: A. 3/32
A mutant strain of E. coli is found that produces both β-galactosidase and permease
constitutively. What are the MOST likely mutations in this strain? (Select all that apply:
hint** There are two correct answers.)
A) lacOc
B) lacI-
C) lacP-
D) mutation in CRP-cAMP binding site
E) lacZ- and lacY- - CORRECT ANSWER: A) lacOc
B) lacI-
A mutation that changes one amino acid codon into another codon (but not a stop
codon)
A) Nonsense
B) Missense - CORRECT ANSWER: B) Missense
A mutation that results in a stop codon where before there was a normal amino acid is
called...
A. Missense mutation
,B. Nonsense mutation
C. Synonymous mutation
D. Conservative mutation - CORRECT ANSWER: B. Nonsense mutation
A mutation that you could not pass on to your offspring would occur in the
A) germ cells
B) somatic cells - CORRECT ANSWER: B) somatic cells
A purple-flowered pea plant of unknown genotype is crossed with a white-flowered pea
plant. Half of the offspring have white flowers. What is the genotype of the purple-
flowered parent?
A)AA
B)Aa
C)aa
D)No basis to decide - CORRECT ANSWER: B)Aa
A single gene can produce different proteins.
A) true
B) false - CORRECT ANSWER: A) true
A testcross involves crossing with a(n) _____ individual and is used to determine the
_____ of the tested parent.
A) homozygous dominant; phenotype
B) homozygous recessive; phenotype
C) homozygous dominant; genotype
D) homozygous recessive; genotype
E) F2 offspring; parental genotype - CORRECT ANSWER: D) homozygous recessive;
genotype
, A woman who has five children (all boys) is planning to have another child. What is the
probability that this child will be a boy?
A) 1/2
B) 1/64
C) 1/32
D) 6/256 - CORRECT ANSWER: A) 1/2
A woman you know has five children - all of whom are boys. What is the probability for a
woman to have five boys out of five children?
A) 1/4
B) 1/8
C) 1/32
D) 1/64 - CORRECT ANSWER: C) 1/32
AaBbCc x aabbcc, What proportion of offspring have the same genotype as first parent?
A) 1/4
B) 1/8
C) 1/16
D) 1/32 - CORRECT ANSWER: B) 1/8
An operon is a:
A) gene coding for a repressor protein.
B) region of DNA consisting of the promoter, the operator, and coding sequences for
structural proteins.
C) region of DNA consisting of the operator and coding sequences for structural
proteins.
D) region of DNA consisting of the promoter and operator sequences needed to
regulate one or more structural genes.
