10/18/26, 11:25 PM BIO102-FinalExam-Answers
1 Consider this Punnett Square and the space that has been left blank (with question marks). If the dominant phenotype for trait "A" is red eyes and the recessive
phenotype is white eyes, what color eyes will individuals with the genotype from the unfilled-in column have?
Choose one answer. a. White eyes.
b. Red eyes.
c. Pink eyes.
d. This cannot be determined from the information given.
2 Consider this Punnett Square. What do the boxes with two letters in each represent?
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Choose one answer. a. The phenotype of two individuals' offspring.
b. The sound Mendel made when he saw that his pea predictions were correct.
c. The genotype of two individuals' offspring.
d. The homozygous dominant genotype.
3 For an autosomal trait that displays typical Mendelian inheritance, you would expect a phenotypic ratio of 3:1 in offspring if the individuals that mated:
Choose one answer. a. Were each heterozygous for that trait.
b. Were a heterozygous individual and a homozygous recessive individual.
c. Were each homozygous recessive for that trait.
d. Were made up (that is, the ratio is not possible).
4 For an autosomal trait that displays typical Mendelian inheritance: you would expect a phenotypic ratio of 1:1 in offspring if the individuals that mated:
Choose one answer. a. Were each heterozygous for that trait.
b. Were a heterozygous individual and a homozygous recessive individual.
c. Were each homozygous recessive for that trait.
d. Were made up (that is, the ratio is not possible).
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,10/18/26, 11:25 PM BIO102-FinalExam-Answers
5 In the coral-reef Punk Blenny (a fish), purple head color is the dominant trait and magenta head color is the recessive. In which of the following cases would you know
the fish's phenotype and genotype?
Choose one answer. a. It is the offspring of two purple-headed blennies and has a purple head.
b. It is the offspring of a heterozygous mother and a homozygous recessive father.
c. It is the offspring of a homozygous dominant mother and a homozygous recessive father.
d. It has a purple head.
6 In the speckled YakkityYak bird, speckles and the song "don'ttalkback" are dominant traits while no speckles and the song "yakkityyakkity" are recessive traits. You cross
a bird that is heterozygous for speckling and recessive for song with a bird that is heterozygous for all traits. What proportion of their offspring will sing
"yakkityyakkity"?
Choose one answer. a. 1/16.
b. 4/16.
c. 6/16.
d. 8/16.
7 Which of the following is a part of Mendel's Law of Segregation?
Choose one answer. a. Genes that affect more than one phenotype can be lethal.
b. Each gamete only carries one allele for a particular trait.
c. Genes that interact together may not assort independently.
d. Recessive alleles for different traits are generally segregated from one another.
8 Which of these is NOT one of the reasons why Mendel would have had difficulty reaching his conclusions if he had studied height in humans instead of seed traits in
pea plants?
Choose one answer. a. Humans have much longer generation times than pea plants.
b. Height in humans is X-linked.
c. Height in humans is polygenic.
d. Humans cannot self-pollinate (or reproduce asexually as well as sexually).
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9 Which of these statements is NOT true about Mendel's work:
Choose one answer. a. It was immediately recognized as a breakthrough by the scientific community.
b. It involved the study of traits that were present in discrete, rather than continuous, forms.
c. It provided evidence for the fact that offspring receive one copy of an allele from each parent.
d. It provided evidence for the fact that alleles for different traits assort independently.
10 You know that tufted feet in chickens is a dominant trait. You have a rooster with tufted feet but don't know its genotype. So you perform a test cross to find out. That
means that:
Choose one answer. a. You cross the rooster with a hen that you know is heterozygous recessive.
b. You cross the rooster with a hen that you know is homozygous recessive.
c. You cross the rooster with a hen of unknown parentage and tufted feet.
d. You cross the rooster with another rooster (just to be safe).
11 A woman who is a carrier (heterozygous) for a recessive disease marries a man who is also a carrier. What is the likelihood that their child will be both healthy and not
a carrier of the disease?
Choose one answer. a. 0 out of 4.
b. 1 out of 4.
c. 2 out of 4.
d. 3 out of 4.
12 A woman who is a carrier (heterozygous) for a recessive disease marries a man who is also a carrier. What is the likelihood that their child will have the disease? (Note:
carriers are healthy.)
Choose one answer. a. 0 out of 4.
b. 1 out of 4.
c. 2 out of 4.
d. 3 out of 4.
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1 Consider this Punnett Square and the space that has been left blank (with question marks). If the dominant phenotype for trait "A" is red eyes and the recessive
phenotype is white eyes, what color eyes will individuals with the genotype from the unfilled-in column have?
Choose one answer. a. White eyes.
b. Red eyes.
c. Pink eyes.
d. This cannot be determined from the information given.
2 Consider this Punnett Square. What do the boxes with two letters in each represent?
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,10/18/26, 11:25 PM BIO102-FinalExam-Answers
Choose one answer. a. The phenotype of two individuals' offspring.
b. The sound Mendel made when he saw that his pea predictions were correct.
c. The genotype of two individuals' offspring.
d. The homozygous dominant genotype.
3 For an autosomal trait that displays typical Mendelian inheritance, you would expect a phenotypic ratio of 3:1 in offspring if the individuals that mated:
Choose one answer. a. Were each heterozygous for that trait.
b. Were a heterozygous individual and a homozygous recessive individual.
c. Were each homozygous recessive for that trait.
d. Were made up (that is, the ratio is not possible).
4 For an autosomal trait that displays typical Mendelian inheritance: you would expect a phenotypic ratio of 1:1 in offspring if the individuals that mated:
Choose one answer. a. Were each heterozygous for that trait.
b. Were a heterozygous individual and a homozygous recessive individual.
c. Were each homozygous recessive for that trait.
d. Were made up (that is, the ratio is not possible).
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,10/18/26, 11:25 PM BIO102-FinalExam-Answers
5 In the coral-reef Punk Blenny (a fish), purple head color is the dominant trait and magenta head color is the recessive. In which of the following cases would you know
the fish's phenotype and genotype?
Choose one answer. a. It is the offspring of two purple-headed blennies and has a purple head.
b. It is the offspring of a heterozygous mother and a homozygous recessive father.
c. It is the offspring of a homozygous dominant mother and a homozygous recessive father.
d. It has a purple head.
6 In the speckled YakkityYak bird, speckles and the song "don'ttalkback" are dominant traits while no speckles and the song "yakkityyakkity" are recessive traits. You cross
a bird that is heterozygous for speckling and recessive for song with a bird that is heterozygous for all traits. What proportion of their offspring will sing
"yakkityyakkity"?
Choose one answer. a. 1/16.
b. 4/16.
c. 6/16.
d. 8/16.
7 Which of the following is a part of Mendel's Law of Segregation?
Choose one answer. a. Genes that affect more than one phenotype can be lethal.
b. Each gamete only carries one allele for a particular trait.
c. Genes that interact together may not assort independently.
d. Recessive alleles for different traits are generally segregated from one another.
8 Which of these is NOT one of the reasons why Mendel would have had difficulty reaching his conclusions if he had studied height in humans instead of seed traits in
pea plants?
Choose one answer. a. Humans have much longer generation times than pea plants.
b. Height in humans is X-linked.
c. Height in humans is polygenic.
d. Humans cannot self-pollinate (or reproduce asexually as well as sexually).
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, 10/18/26, 11:25 PM BIO102-FinalExam-Answers
9 Which of these statements is NOT true about Mendel's work:
Choose one answer. a. It was immediately recognized as a breakthrough by the scientific community.
b. It involved the study of traits that were present in discrete, rather than continuous, forms.
c. It provided evidence for the fact that offspring receive one copy of an allele from each parent.
d. It provided evidence for the fact that alleles for different traits assort independently.
10 You know that tufted feet in chickens is a dominant trait. You have a rooster with tufted feet but don't know its genotype. So you perform a test cross to find out. That
means that:
Choose one answer. a. You cross the rooster with a hen that you know is heterozygous recessive.
b. You cross the rooster with a hen that you know is homozygous recessive.
c. You cross the rooster with a hen of unknown parentage and tufted feet.
d. You cross the rooster with another rooster (just to be safe).
11 A woman who is a carrier (heterozygous) for a recessive disease marries a man who is also a carrier. What is the likelihood that their child will be both healthy and not
a carrier of the disease?
Choose one answer. a. 0 out of 4.
b. 1 out of 4.
c. 2 out of 4.
d. 3 out of 4.
12 A woman who is a carrier (heterozygous) for a recessive disease marries a man who is also a carrier. What is the likelihood that their child will have the disease? (Note:
carriers are healthy.)
Choose one answer. a. 0 out of 4.
b. 1 out of 4.
c. 2 out of 4.
d. 3 out of 4.
https://saylordotorg.github.io/LegacyExams/BIO/BIO102/BIO102-FinalExam-Answers.html 4/32
