1|Page
BIO 340 FINAL EXAM VERSION C NEWEST 2025/ 2026
COMPLETE 100 QUESTIONS AND ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||LATESTST UPDATE!!!
Genetic inheritance is being studied in a certain species of
plant in which orange flower color (O) is dominant to white
(o) and round leaf shape (S) is dominant to oval (s). A
true-breeding orange-flowered, round-leaved male plant
(Plant A) is mated with a true-breeding white-flowered,
oval-leaved female plant (Plant B) to produce dihybrid
offspring plant (Plant C). Assuming normal Mendelian
genetics and independent inheritance of these two traits,
which gametes might be produced by Plant C?
a. OoSs
b. OS
c. oS
d. Both OS and oS
e. Both OoSs and OS - ANSWER-d. Both OS and oS
In guinea pigs coat color is determined by a single gene
with two alleles. A guinea pig from a true-breeding black
strain is mated with a guinea pig from a true-breeding
white strain. The F1 progeny are all black. Two of the F1
progeny are mated with each other. What proportion of the
F2 progeny is expected to be white?
,2|Page
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER-c. 1/4
In guinea pigs coat color is determined by a single gene
with two alleles. A guinea pig from a true-breeding black
strain is mated with a guinea pig from a true-breeding
white strain. The F1 progeny are all black. Two of the F1
progeny are mated with each other. What proportion of the
black F2 progeny is expected to be homozygous?
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER-b. 1/3
The presence of short hairs on leaves is controlled by
dominant allele H. Plants with genotype hh have smooth
leaves. Two parental plants with unknown genotype were
crossed. What are the parental genotypes if F1= 32 Hairy
and 11 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
,3|Page
d. hh x hh
e. HH x HH - ANSWER-c. Hh x Hh
The presence of short hairs on leaves is controlled by
dominant allele H. Plants with genotype hh have smooth
leaves. Two parental plants with unknown genotype were
crossed. What are the parental genotypes if F1= 0 Hairy
and 24 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
d. hh x hh
e. HH x HH - ANSWER-d. hh x hh
Mendel imagined that seed color in pea plants is
influenced by a gene with two alleles in which the allele for
yellow seeds (Y) is dominant over the allele for green
seeds (y). What would Mendel predict the seed colors
would be from a cross of a male plant with the mixed Yy
genotype with a female plant with the yy genotype?
a. All seeds should be green.
b. All seeds should be yellow.
c. There should be 3 green seeds for every 1 yellow seed.
d. There should be 1 green seed for every 3 yellow seeds.
, 4|Page
e. There should be 1 green seed for every 1 yellow seed. -
ANSWER-e. There should be 1 green seed for every 1
yellow seed.
In apples, the allele A is dominant for a big size apple and
the allele R is dominant for red color. You cross one tree
that produces big yellow apples and another tree that
produces small red apples. Half of the offspring trees
produce big red apples and half produce big yellow
apples. What are the genotypes of the parents?
a. AArr and aaRr
b. Aarr and aaRr
c. AARr and AArr
d. AaRr and AaRr
e. AaRr and aarr - ANSWER-a. AArr and aaRr
John has alkaptonuria; it "runs in the family". John and his
grandmother are both homozygous for alkaptonuria.
John's grandmother has two brothers and a sister. One of
the brothers had alkaptonuria and his daughter is John's
mother. Based on this information, John's parents are:
a. Both homozygous for the alkaptonuria gene.
b. Both heterozygous for the alkaptonuria gene.
c. Not carrying the alkaptonuria gene.
BIO 340 FINAL EXAM VERSION C NEWEST 2025/ 2026
COMPLETE 100 QUESTIONS AND ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||LATESTST UPDATE!!!
Genetic inheritance is being studied in a certain species of
plant in which orange flower color (O) is dominant to white
(o) and round leaf shape (S) is dominant to oval (s). A
true-breeding orange-flowered, round-leaved male plant
(Plant A) is mated with a true-breeding white-flowered,
oval-leaved female plant (Plant B) to produce dihybrid
offspring plant (Plant C). Assuming normal Mendelian
genetics and independent inheritance of these two traits,
which gametes might be produced by Plant C?
a. OoSs
b. OS
c. oS
d. Both OS and oS
e. Both OoSs and OS - ANSWER-d. Both OS and oS
In guinea pigs coat color is determined by a single gene
with two alleles. A guinea pig from a true-breeding black
strain is mated with a guinea pig from a true-breeding
white strain. The F1 progeny are all black. Two of the F1
progeny are mated with each other. What proportion of the
F2 progeny is expected to be white?
,2|Page
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER-c. 1/4
In guinea pigs coat color is determined by a single gene
with two alleles. A guinea pig from a true-breeding black
strain is mated with a guinea pig from a true-breeding
white strain. The F1 progeny are all black. Two of the F1
progeny are mated with each other. What proportion of the
black F2 progeny is expected to be homozygous?
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER-b. 1/3
The presence of short hairs on leaves is controlled by
dominant allele H. Plants with genotype hh have smooth
leaves. Two parental plants with unknown genotype were
crossed. What are the parental genotypes if F1= 32 Hairy
and 11 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
,3|Page
d. hh x hh
e. HH x HH - ANSWER-c. Hh x Hh
The presence of short hairs on leaves is controlled by
dominant allele H. Plants with genotype hh have smooth
leaves. Two parental plants with unknown genotype were
crossed. What are the parental genotypes if F1= 0 Hairy
and 24 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
d. hh x hh
e. HH x HH - ANSWER-d. hh x hh
Mendel imagined that seed color in pea plants is
influenced by a gene with two alleles in which the allele for
yellow seeds (Y) is dominant over the allele for green
seeds (y). What would Mendel predict the seed colors
would be from a cross of a male plant with the mixed Yy
genotype with a female plant with the yy genotype?
a. All seeds should be green.
b. All seeds should be yellow.
c. There should be 3 green seeds for every 1 yellow seed.
d. There should be 1 green seed for every 3 yellow seeds.
, 4|Page
e. There should be 1 green seed for every 1 yellow seed. -
ANSWER-e. There should be 1 green seed for every 1
yellow seed.
In apples, the allele A is dominant for a big size apple and
the allele R is dominant for red color. You cross one tree
that produces big yellow apples and another tree that
produces small red apples. Half of the offspring trees
produce big red apples and half produce big yellow
apples. What are the genotypes of the parents?
a. AArr and aaRr
b. Aarr and aaRr
c. AARr and AArr
d. AaRr and AaRr
e. AaRr and aarr - ANSWER-a. AArr and aaRr
John has alkaptonuria; it "runs in the family". John and his
grandmother are both homozygous for alkaptonuria.
John's grandmother has two brothers and a sister. One of
the brothers had alkaptonuria and his daughter is John's
mother. Based on this information, John's parents are:
a. Both homozygous for the alkaptonuria gene.
b. Both heterozygous for the alkaptonuria gene.
c. Not carrying the alkaptonuria gene.
