Question detail

Which option avoids the common misconception in this objective for Reproduction, Genetic inheritance: students must explain that a dominant allele is expressed if one copy is present.

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At a glance

MCQ

Type

practice

Style

Topic

Reproduction

Question

A. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.
B. Common misconception: Explaining protein coding without naming the gene as the relevant section of DNA. This would blur DNA vs genes instead of testing Genetic inheritance.
C. Partial misconception: Treating DNA as if it always means one gene. This misses the objective focus on explain that a dominant allele is expressed if one copy is present.
D. Terminology mix-up: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Genetic inheritance.

Answer

Explanation

The correct option is Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present. is correct because A DNA base sequence is the storage format; a gene is the named instruction unit. The learning objective says students must explain that a dominant allele is expressed if one copy is present, so the answer must stay inside Genetic inheritance. The alternative options are wrong because they either explaining protein coding without naming the gene as the relevant section of dna., treating dna as if it always means one gene., or drift away from do not use dna, gene, and chromosome as interchangeable answers..

Common mistake

Misinterpreting Dominance

Students often think a dominant allele must be present in both copies to be expressed, or that a recessive allele can override a dominant one if present in one copy.

Clarify that a dominant allele is expressed whenever it is present in at least one copy of a gene pair; the presence of a single dominant allele is sufficient for the dominant phenotype, regardless of the other allele’s type.

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