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.
Definitions. A dominant trait is one that is expressed in an individual who has only one copy of that gene. A recessive trait occurs when a person gets two copies of a mutant gene, or one from each parent.ow They Are Expressed. Dominant and recessive traits are expressed differently when referring to the Punnett Square developed by Gregor Mendel. A dominant trait is expressed by an uppercase letter, while a recessive gene is represented by a lower case letter.