Question

What condition must be met for a recessive trait to express itself in an organism?

Options

• Both alleles must be recessive (homozygous recessive)

• Only one recessive allele is needed

• The recessive allele must be on a dominant chromosome

• The organism must be heterozygous

Answer 1

A recessive trait can only be expressed when an organism has two copies of the recessive allele (homozygous recessive condition). In the heterozygous state, the recessive allele is masked by the dominant allele's expression.