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When can a recessive trait appear?

Answer and explanation

Correct answer: When both copies of it are present

The governing concept is recessive inheritance. A recessive allele is usually masked when a dominant allele is present in a heterozygous individual. It is expressed when an individual receives the recessive allele from both parents, producing a homozygous recessive condition. Thus option A is correct, with “both copies” referring to the two recessive alleles. A dominant allele does not reveal the recessive phenotype, and fossils or absence of reproductive cells are irrelevant.

Related tags

Recessive TraitMendelian GeneticsTrait ExpressionHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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