Question detail
Which option correctly contrasts the named ideas for Reproduction, Genetic inheritance: students must use direct proportion and simple ratios to express outcomes of a genetic cross.
Try the question, check the answer, then read the explanation to understand the curriculum point.
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 use direct proportion and simple ratios to express outcomes of a genetic cross.
- 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 use direct proportion and simple ratios to express outcomes of a genetic cross.
- 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 use direct proportion and simple ratios to express outcomes of a genetic cross.. 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 use direct proportion and simple ratios to express outcomes of a genetic cross.. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches Genetic inheritance because students must use direct proportion and simple ratios to express outcomes of a genetic cross. is correct because DNA can contain many genes; a gene has a specific coding role. 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 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 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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