Which option gives the correct cause-and-effect relationship for Reproduction, Genetic inheritance: students must explain that a recessive allele is expressed only when two copies are present and no dominant allele is present.

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 a recessive allele is expressed only when two copies are present and no dominant allele is present.. It is the only option that keeps DNA vs genes separate and answers the approved learning objective in Genetic inheritance.

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 a recessive allele is expressed only when two copies are present and no dominant allele is present.. 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 a recessive allele is expressed only when two copies are present and no dominant allele is present. is correct because DNA is the molecule; a gene is a functional section of that molecule. The learning objective says students must explain that a recessive allele is expressed only when two copies are present and no dominant allele is present, 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..