Question detail
Which option gives the correct cause-and-effect relationship 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 cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.
- B. Reversed cause: Treating DNA as if it always means one gene. This would blur DNA vs genes instead of testing Inherited disorders.
- C. Missing link: Calling a gene a whole chromosome. This misses the objective focus on describe polydactyly as an inherited disorder caused by a dominant allele.
- D. Different process: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Inherited disorders.
Answer
The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. 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 cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele.. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Inherited disorders because students must describe polydactyly as an inherited disorder caused by a dominant allele. is correct because DNA is the molecule; a gene is a functional section of that molecule. 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 treating dna as if it always means one gene., calling a gene a whole chromosome., or drift away from when asking about dna, test molecular structure, base sequence, nucleotides, or genetic information storage..
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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