Question detail

Which option avoids the common misconception in this objective for Reproduction, Genetic inheritance: students must use direct proportion and simple ratios to express outcomes of a genetic cross.

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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 use direct proportion and simple ratios to express outcomes of a genetic cross.
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 use direct proportion and simple ratios to express outcomes of a genetic cross.
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 use direct proportion and simple ratios to express outcomes of a genetic cross.. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Genetic inheritance because students must use direct proportion and simple ratios to express outcomes of a genetic cross. is correct because A DNA base sequence is the storage format; a gene is the named instruction unit. The learning objective says students must use direct proportion and simple ratios to express outcomes of a genetic cross, 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 Ratios as Percentages

Students often treat the simple ratio 1:2:1 from a heterozygous cross (Aa × Aa) as if it were a percentage, writing 25%:50%:25% instead of the correct ratio of 1:2:1.

Explain that a ratio shows the relative frequency of each genotype or phenotype, not a proportion of 100. Use the ratio 1:2:1 directly, or convert it to percentages by dividing each part by the total (4) and multiplying by 100, giving 25%:50%:25% only after the conversion step.

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