Whatâs more, they are not regulated by the FDA. This means manufacturers can put in anything they want to, including cheap toxic chemicals with highly harmful effects in the body. Why does this matter if youâre not drinking shampoo? Any substance you rub on your skin or inhale will enter your body just as surely as if you had swallowed it.
Recessive trait. Definition. noun. (genetics) A genetic trait that results from the expression of the two recessive alleles. Supplement. When the dominant allele is lacking or when the two alleles present are both recessive, their expression results in a recessive trait.
Definition of recessive. 1  1a : tending to recedeb : withdrawn 2. 2  2a : producing little or no phenotypic effect when occurring in heterozygous condition with a contrasting allele recessive genesb : expressed only when the determining gene is in the homozygous condition recessive traits a recessive disease.