Question detail

Which option gives the correct cause-and-effect relationship for Reproduction, Genetic inheritance: students must explain that different forms of a gene are called alleles.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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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 Genetic inheritance because students must explain that different forms of a gene are called alleles.
B. Reversed cause: Treating DNA as if it always means one gene. This would blur DNA vs genes instead of testing Genetic inheritance.
C. Missing link: Calling a gene a whole chromosome. This misses the objective focus on explain that different forms of a gene are called alleles.
D. Different process: It moves into a neighbouring Unit 4.6 idea rather than Reproduction / Genetic inheritance.

Answer

The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that different forms of a gene are called alleles.. 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 cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that different forms of a gene are called alleles.. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic inheritance because students must explain that different forms of a gene are called alleles. is correct because DNA is the molecule; a gene is a functional section of that molecule. The learning objective says students must explain that different forms of a gene are called alleles, so the answer must stay inside Genetic inheritance. 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

Confusing alleles with genes

Students often say that alleles are the same as genes, or that a gene can have only one allele, instead of recognising that a gene is a locus on a chromosome and that each locus can have multiple alleles.

Explain that a gene is a specific location on a chromosome that can exist in different forms (alleles). Clarify that each individual carries two alleles for a gene (one from each parent) and that the set of all possible alleles for a gene is called the allele pool. Use examples such as the gene for flower colour in pea plants having alleles for purple, white, and pink to illustrate the concept.

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