Question detail
Which option correctly contrasts the named ideas for Reproduction, Genetic inheritance: students must explain the terms homozygous and heterozygous.
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 explain the terms homozygous and heterozygous.
- 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 explain the terms homozygous and heterozygous.
- 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 explain the terms homozygous and heterozygous.. 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 explain the terms homozygous and heterozygous.. Correct contrast: DNA can contain many genes; a gene has a specific coding role. This matches Genetic inheritance because students must explain the terms homozygous and heterozygous. is correct because DNA can contain many genes; a gene has a specific coding role. The learning objective says students must explain the terms homozygous and heterozygous, 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
Confusing homozygous with heterozygous
Students often think a homozygous individual has two different alleles, or that heterozygous means both alleles are the same.
Clarify that homozygous means both alleles are identical (AA or aa) and heterozygous means the two alleles are different (Aa).
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