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BIOL 1107
BIOL 1107 Exam 4 – Principles of Biology I
(Latest 2026/ 2027 Update) Review| 100%
Verified Questions & Answers | Grade A
1. Dominant traits are beneficial for organisms.
A. always B. sometimes C. never: B. sometimes
2. Dominant traits are common in
populations.
A. always B. sometimes C. never: B. sometimes
3. Assume the earlobe shape is controlled by a single gene that has two alleles. Dominant
alleles will produce free earlobes, while the recessive allele promotes attached earlobes.
Leonard has free earlobes, while Penny and their first child both have attached earlobes.
What is the probability that their second child will have free earlobes?
A. 0% B. 75% C. 100% D. 25% E. 50%: E. 50%
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4. Assume fur color in mice is determined by a gene with two alleles, and brown is
dominant to white. If you cross a brown mouse with a white one and get six brown and
two white offspring, what are the genotypes of the two parent mice?
A. BB&bb B. BB&Bb C. Bb&Bb D. Bb&bb: D. Bb&bb
5. Romeo and Juliet are both carriers of cystic fibrosis. This disorder is autosomal recessive
and caused by a mutation in the CFTR gene, resulting in the production of thick mucus.
What is the probability that their child would be a carrier daughter or a son with cystic
fibrosis?
A. 1/8 B. 3/4 C. 1/32 D. 3/8 E. 1/4: D. 3/8
6. Katniss and Peeta are normal, but each has a parent with Wilson's disease. This
condition is autosomal recessive and caused by a mutation in the ATP7B gene, resulting in
the inability to dispose of copper. What is the probability that two of their three kids will
have the disorder?
A. 9/64 B. 3/16 C. 1/2 D. 1/16 E. 3/64: A. 9/64
7. Assume the earlobe shape is determined by a single gene with two alleles.
Dominant alleles will promote free earlobes, while the recessive allele produces attached
earlobes. A second gene on a different chromosome controls earwax consistency, where
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wet is dominant and dry is recessive. Bella has free earlobes with wetearwax and is
heterozygous for both traits. Edward has attached earlobes with dry earwax. What is the
probability of their kid having both recessive traits?
A. 0% B. 75% C. 100% D. 25% E. 50%: D. 25%
8. If a dog is heterozygous for an autosomal gene that affects hearing (Hh), which
genotypes are possible in a cell at the beginning of meiosis II?
A. HH B. h C. Hh D. H E. hh: a, c, e
9. Assume hair curliness is controlled by a gene that is on an autosome and has two
alleles. Dominant alleles result in curly hair, recessive alleles produce straight hair, and
heterozygotes have wavy hair. Han has curly hair, while Leia has wavy hair. Han and Leia
are both normal, but their first child has maple syrup urine disease, which is an
autosomal recessive disorder. What is the probability that their second child will be a
daughter who has wavy hair and is also a carrier for maple syrup urine disease?
A. 3/4 B. 1/8 C. 3/16 D. 1/4 E. 3/8: b. 1/8
10. Rh factor is a protein found on red blood cells that is inherited in a Mendelian pattern
(+ is dominant to −)and independently of ABO. Buttercup is type A− with parents who
were both type AB+, and Westley is type B+ with parents who were type AB− and O+.
BIOL 1107
BIOL 1107
BIOL 1107 Exam 4 – Principles of Biology I
(Latest 2026/ 2027 Update) Review| 100%
Verified Questions & Answers | Grade A
1. Dominant traits are beneficial for organisms.
A. always B. sometimes C. never: B. sometimes
2. Dominant traits are common in
populations.
A. always B. sometimes C. never: B. sometimes
3. Assume the earlobe shape is controlled by a single gene that has two alleles. Dominant
alleles will produce free earlobes, while the recessive allele promotes attached earlobes.
Leonard has free earlobes, while Penny and their first child both have attached earlobes.
What is the probability that their second child will have free earlobes?
A. 0% B. 75% C. 100% D. 25% E. 50%: E. 50%
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BIOL 1107
4. Assume fur color in mice is determined by a gene with two alleles, and brown is
dominant to white. If you cross a brown mouse with a white one and get six brown and
two white offspring, what are the genotypes of the two parent mice?
A. BB&bb B. BB&Bb C. Bb&Bb D. Bb&bb: D. Bb&bb
5. Romeo and Juliet are both carriers of cystic fibrosis. This disorder is autosomal recessive
and caused by a mutation in the CFTR gene, resulting in the production of thick mucus.
What is the probability that their child would be a carrier daughter or a son with cystic
fibrosis?
A. 1/8 B. 3/4 C. 1/32 D. 3/8 E. 1/4: D. 3/8
6. Katniss and Peeta are normal, but each has a parent with Wilson's disease. This
condition is autosomal recessive and caused by a mutation in the ATP7B gene, resulting in
the inability to dispose of copper. What is the probability that two of their three kids will
have the disorder?
A. 9/64 B. 3/16 C. 1/2 D. 1/16 E. 3/64: A. 9/64
7. Assume the earlobe shape is determined by a single gene with two alleles.
Dominant alleles will promote free earlobes, while the recessive allele produces attached
earlobes. A second gene on a different chromosome controls earwax consistency, where
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wet is dominant and dry is recessive. Bella has free earlobes with wetearwax and is
heterozygous for both traits. Edward has attached earlobes with dry earwax. What is the
probability of their kid having both recessive traits?
A. 0% B. 75% C. 100% D. 25% E. 50%: D. 25%
8. If a dog is heterozygous for an autosomal gene that affects hearing (Hh), which
genotypes are possible in a cell at the beginning of meiosis II?
A. HH B. h C. Hh D. H E. hh: a, c, e
9. Assume hair curliness is controlled by a gene that is on an autosome and has two
alleles. Dominant alleles result in curly hair, recessive alleles produce straight hair, and
heterozygotes have wavy hair. Han has curly hair, while Leia has wavy hair. Han and Leia
are both normal, but their first child has maple syrup urine disease, which is an
autosomal recessive disorder. What is the probability that their second child will be a
daughter who has wavy hair and is also a carrier for maple syrup urine disease?
A. 3/4 B. 1/8 C. 3/16 D. 1/4 E. 3/8: b. 1/8
10. Rh factor is a protein found on red blood cells that is inherited in a Mendelian pattern
(+ is dominant to −)and independently of ABO. Buttercup is type A− with parents who
were both type AB+, and Westley is type B+ with parents who were type AB− and O+.
BIOL 1107
