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.
Of or relating to a trait that is expressed only when the determining allele is present in the homozygous condition. n. Genetics. 1. A recessive allele or trait. 2. An organism having a recessive trait.. Genetics. a. pertaining to the allele of a gene pair whose effect is masked by the second allele when both are present in the same cell or organism. b. of or pertaining to the hereditary trait determined by such an allele. 3. Genetics. Compare dominant (def. 6). a. the recessive allele of a gene pair.