Question detail
Which option avoids the common misconception in this objective for Reproduction, Inherited disorders: students must describe polydactyly as an inherited disorder caused by a dominant allele.
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. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.
- 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 Inherited disorders.
- C. Partial misconception: Treating DNA as if it always means one gene. This misses the objective focus on describe polydactyly as an inherited disorder caused by a dominant allele.
- D. Terminology mix-up: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Inherited disorders.
Answer
The correct option is Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.. It is the only option that keeps DNA vs genes separate and answers the approved learning objective in Inherited disorders.
Explanation
The correct option is Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.. Misconception avoided: A DNA base sequence is the storage format; a gene is the named instruction unit. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele. is correct because A DNA base sequence is the storage format; a gene is the named instruction unit. The learning objective says students must describe polydactyly as an inherited disorder caused by a dominant allele, so the answer must stay inside Inherited disorders. 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
Understanding Polydactyly
Students often confuse polydactyly as a recessive disorder instead of recognizing it as caused by a dominant allele.
Remember that polydactyly is expressed when at least one dominant allele is present. Review examples of dominant and recessive traits to clarify this distinction.
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