Answer and explanation

Correct answer: B. A version of a gene found at the same position on homologous chromosomes

  1. Step 1: A gene can exist in several forms. Step 2. Each form is an allele at the same locus. Answer: a version of a gene. Why not the others: a different gene is not an allele, mutations do not always cause disease, and proteins are products.

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What is an allele? | French Baccalaureat