Arefers to the expressed variation of a trait in a population. marine

Phenotype, I believe this is the right answer. Phenotypes are expressed forms of genotypes. Genotypes may be YY, Yy, yy (just an example, where Y codes for the pigment yellow in skin, and Y is the dominant allele to y which is recessive and which results in white / albino skin in the absence of dominant allele).
Phenotypes of organisms will be Yellow skin, Yellow skin, and White / albino skin.

Hope this helps! :)

The plates kept rubbing together