Question detail
Which option correctly contrasts the named ideas 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. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.
- B. Reversed contrast: Calling a gene a whole chromosome. This would blur DNA vs genes instead of testing Inherited disorders.
- C. Over-broad contrast: Explaining protein coding without naming the gene as the relevant section of DNA. This misses the objective focus on describe polydactyly as an inherited disorder caused by a dominant allele.
- D. Unrelated contrast: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Inherited disorders.
Answer
The correct option is Correct contrast: DNA can contain many genes; a gene has a specific coding role. 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 Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele. is correct because DNA can contain many genes; a gene has a specific coding role. 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 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
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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