Which term describes the expression of a trait?

phenotype
genotype
dna
rna

Explanation:

The term "phenotype" alludes to the perceptible physical properties of a living being; these incorporate the living being's appearance, improvement, and conduct. A living being's phenotype is dictated by its genotype, which is the arrangement of qualities the living being conveys, just as by ecological impacts upon these qualities. Because of the impact of natural elements, creatures with indistinguishable genotypes, for example, indistinguishable twins, at last express nonidentical phenotypes on the grounds that every living being experiences novel ecological impacts as it creates. Instances of phenotypes incorporate stature, wing length, and hair shading.

Phenotypes likewise incorporate discernible qualities that can be estimated in the research center, for example, dimensions of hormones or blood cells.

you so !

the answer to your question is,

d. when a child was born.

-mabel < 3