MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: D. Having two identical alleles at a locus
Explanation:
A homozygous individual may be dominant or recessive.
Both homologous chromosomes carry the same allele.
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Correct Answer: D. A change affecting a single nucleotide pair
Explanation:
Point mutations include substitutions and small insertions or deletions.
Their effects vary with location and type.
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Correct Answer: A. Having two identical alleles at a locus
Explanation:
A homozygous individual may be dominant or recessive.
Both homologous chromosomes carry the same allele.
Choose an option to check your answer.
Correct Answer: A. A change affecting a single nucleotide pair
Explanation:
Point mutations include substitutions and small insertions or deletions.
Their effects vary with location and type.
Choose an option to check your answer.
Correct Answer: B. Having two identical alleles at a locus
Explanation:
A homozygous individual may be dominant or recessive.
Both homologous chromosomes carry the same allele.
Choose an option to check your answer.
Correct Answer: C. Having two different alleles at a locus
Explanation:
A heterozygote carries two allele forms.
Its phenotype depends on their interaction.
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Correct Answer: D. Having two different alleles at a locus
Explanation:
A heterozygote carries two allele forms.
Its phenotype depends on their interaction.
Choose an option to check your answer.
Correct Answer: A. Having two different alleles at a locus
Explanation:
A heterozygote carries two allele forms.
Its phenotype depends on their interaction.
Choose an option to check your answer.
Correct Answer: B. The two alleles of a gene separate during gamete formation
Explanation:
Each gamete receives one allele from a pair.
Fertilization restores the pair.
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Correct Answer: C. The two alleles of a gene separate during gamete formation
Explanation:
Each gamete receives one allele from a pair.
Fertilization restores the pair.
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Correct Answer: D. The two alleles of a gene separate during gamete formation
Explanation:
Each gamete receives one allele from a pair.
Fertilization restores the pair.
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Correct Answer: A. Alleles of different genes assort independently when genes are unlinked
Explanation:
Independent assortment arises from random orientation of homologous pairs.
Linked genes may not assort independently.
