Question detail

Which option gives the correct cause-and-effect relationship for Reproduction, Genetic inheritance: students must explain that a dominant allele is expressed if one copy is present.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Reproduction

Question

A. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.
B. Reversed cause: Treating DNA as if it always means one gene. This would blur DNA vs genes instead of testing Genetic inheritance.
C. Missing link: Calling a gene a whole chromosome. This misses the objective focus on explain that a dominant allele is expressed if one copy is present.
D. Different process: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Genetic inheritance.

Answer

The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.. It is the only option that keeps DNA vs genes separate and answers the approved learning objective in Genetic inheritance.

Explanation

The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present. is correct because DNA is the molecule; a gene is a functional section of that molecule. 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 treating dna as if it always means one gene., calling a gene a whole chromosome., or drift away from when asking about dna, test molecular structure, base sequence, nucleotides, or genetic information storage..

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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