Question

What allele is expressed as a phenotype only when two copies are present in the genotype?

A.
Dominant allele

B.
Recessive allele

Answer 1

Answer: Individuals inherit two versions of each gene, known as alleles, from each parent. In the case of a recessive trait, the alleles of the trait-causing gene are the same, and both (recessive) alleles must be present to express the trait. A recessive allele does not produce a trait at all when only one copy is present.

Step-by-step explanation:

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