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(B) In genetics,a recessive trait is a trait that is masked by the presence of a dominant allele. According to Mendel's law of dominance,a recessive t

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is expressed only in the homozygous condition.

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(B) In genetics,a recessive trait is a trait that is masked by the presence of a dominant allele. According to Mendel's law of dominance,a recessive trait can only be expressed phenotypically when the organism is homozygous for that trait (i.e.,it possesses two copies of the recessive allele,such as $aa$). In the heterozygous condition (e.g.,$Aa$),the dominant allele masks the expression of the recessive allele,preventing the recessive trait from appearing. Therefore,the correct option is $B$.

$A$ recessive trait is one that -

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