Page 1 of 109
CCBC BIO 110 EXAM ALL COMPLETE QUESTIONS
AND SOLUTIONS LATEST UPDATE JUST RELEASED
THIS YEAR
Question: Skin color in a certain species of fish is inherited via a single gene with four different
alleles. How many different types of gametes would be possible in this system?
a) 8
b) 4
c) 2
d) 16 - CORRECT ANSWER✔✔b) 4
Question: Height in humans generally shows a normal (bell-shaped) distribution. What type of
inheritance most likely determines height?
a) a combination of complete dominance and environmental factors
b) incomplete dominance
c) a combination of polygenic inheritance and environmental factors
d) a combination of multiple alleles and codominance
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e) a combination of epistasis and environmental factors - CORRECT ANSWER✔✔c) a
combination of polygenic inheritance and environmental factors
Question: You cross a true-breeding red-flowered snapdragon with a true-breeding white-
flowered one. All of the F1 are pink. What does this say about the parental traits?
a) Both red and white are pleiotropic.
b) Pink is dominant, and red and white are recessive.
c) Red shows incomplete dominance over white.
d) Red is completely dominant. - CORRECT ANSWER✔✔c) Red shows incomplete dominance
over white.
Question: In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr)
offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce
offspring in the ratio of 1 red:2 roan:1 white?
a) red × roan
b) red × white
c) white × roan
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d) roan × roan - CORRECT ANSWER✔✔d) roan × roan
Question: Radish flowers may be red, purple, or white. A cross between a red-flowered plant
and a white-flowered plant yields all-purple offspring. The flower color trait in radishes is an
example of which of the following?
a) sex linkage
b) incomplete dominance
c) codominance
d) a multiple allelic system - CORRECT ANSWER✔✔b) incomplete dominance
Q:A gene that affects the expression of a second gene is an example of __________________.
a) pleiotropy
b) codominance
c) epistasis
d) polygenic inheritance
e) incomplete dominance - CORRECT ANSWER✔✔c) epistasis
, Page 4 of 109
Question: __________ is an example of a character that is controlled by more than one gene (a
quantitative character) and demonstrates a continuum of phenotypes.
a) Pleiotropy
b) Polygenic inheritance
c) Epistasis
d) Codominance
e) Incomplete dominance - CORRECT ANSWER✔✔b) Polygenic inheritance
Question: The gene controlling ear color in an organism known as a gizmo has two alleles that
exhibit incomplete dominance: CR, which codes for red ears; and CY, which codes for yellow
ears. Individuals that are homozygous for the CR allele have red ears, whereas the heterozygous
genotype produces orange ears. Those that are homozygous for the CY allele have yellow ears.
If two individuals with orange ears are crossed, what ratio of phenotypes should be expected in
the offspring?
a) 9:3:1, red:yellow:orange ears
b) 3:1, red:yellow ears
c) 1:2:1, red:orange:yellow ears
CCBC BIO 110 EXAM ALL COMPLETE QUESTIONS
AND SOLUTIONS LATEST UPDATE JUST RELEASED
THIS YEAR
Question: Skin color in a certain species of fish is inherited via a single gene with four different
alleles. How many different types of gametes would be possible in this system?
a) 8
b) 4
c) 2
d) 16 - CORRECT ANSWER✔✔b) 4
Question: Height in humans generally shows a normal (bell-shaped) distribution. What type of
inheritance most likely determines height?
a) a combination of complete dominance and environmental factors
b) incomplete dominance
c) a combination of polygenic inheritance and environmental factors
d) a combination of multiple alleles and codominance
, Page 2 of 109
e) a combination of epistasis and environmental factors - CORRECT ANSWER✔✔c) a
combination of polygenic inheritance and environmental factors
Question: You cross a true-breeding red-flowered snapdragon with a true-breeding white-
flowered one. All of the F1 are pink. What does this say about the parental traits?
a) Both red and white are pleiotropic.
b) Pink is dominant, and red and white are recessive.
c) Red shows incomplete dominance over white.
d) Red is completely dominant. - CORRECT ANSWER✔✔c) Red shows incomplete dominance
over white.
Question: In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr)
offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce
offspring in the ratio of 1 red:2 roan:1 white?
a) red × roan
b) red × white
c) white × roan
, Page 3 of 109
d) roan × roan - CORRECT ANSWER✔✔d) roan × roan
Question: Radish flowers may be red, purple, or white. A cross between a red-flowered plant
and a white-flowered plant yields all-purple offspring. The flower color trait in radishes is an
example of which of the following?
a) sex linkage
b) incomplete dominance
c) codominance
d) a multiple allelic system - CORRECT ANSWER✔✔b) incomplete dominance
Q:A gene that affects the expression of a second gene is an example of __________________.
a) pleiotropy
b) codominance
c) epistasis
d) polygenic inheritance
e) incomplete dominance - CORRECT ANSWER✔✔c) epistasis
, Page 4 of 109
Question: __________ is an example of a character that is controlled by more than one gene (a
quantitative character) and demonstrates a continuum of phenotypes.
a) Pleiotropy
b) Polygenic inheritance
c) Epistasis
d) Codominance
e) Incomplete dominance - CORRECT ANSWER✔✔b) Polygenic inheritance
Question: The gene controlling ear color in an organism known as a gizmo has two alleles that
exhibit incomplete dominance: CR, which codes for red ears; and CY, which codes for yellow
ears. Individuals that are homozygous for the CR allele have red ears, whereas the heterozygous
genotype produces orange ears. Those that are homozygous for the CY allele have yellow ears.
If two individuals with orange ears are crossed, what ratio of phenotypes should be expected in
the offspring?
a) 9:3:1, red:yellow:orange ears
b) 3:1, red:yellow ears
c) 1:2:1, red:orange:yellow ears
