Multiple choice

An allele can be described as

  1. a homozygous genotype

  2. a heterozygous genotype

  3. a substitute for a gene

  4. one of several possible forms of a gene

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D Correct answer
Explanation

An allele is an alternate form of a gene. If an individual is homozygous (YY or GG) for a trait, it has inherited the same allele from both parents. If it is heterozygous (YG), it has inherited different alleles for the trait.