Question detail

Which option correctly contrasts the named ideas 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 contrast: DNA can contain many genes; a gene has a specific coding role. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.
B. Reversed contrast: Calling a gene a whole chromosome. This would blur DNA vs genes instead of testing Genetic inheritance.
C. Over-broad contrast: Explaining protein coding without naming the gene as the relevant section of DNA. This misses the objective focus on explain that a dominant allele is expressed if one copy is present.
D. Unrelated contrast: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Genetic inheritance.

Answer

The correct option is Correct contrast: DNA can contain many genes; a gene has a specific coding role. 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 contrast: DNA can contain many genes; a gene has a specific coding role. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present.. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches Genetic inheritance because students must explain that a dominant allele is expressed if one copy is present. is correct because DNA can contain many genes; a gene has a specific coding role. 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 calling a gene a whole chromosome., explaining protein coding without naming the gene as the relevant section of dna., or drift away from when asking about genes, test a section of dna, protein coding, alleles, or inherited characteristics..

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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