Phenotypes are seen due to the production of ___ from the genotypic code found in the cell nucleus.

Phenotypes, which refer to the observable physical or biochemical characteristics of an organism, arise directly from the expression of proteins that are encoded by genes within the organism's DNA. The genotypic code, which is the genetic makeup or sequence of an organism's DNA, is transcribed into messenger RNA (mRNA) in the cell nucleus. This mRNA is then translated into protein in the cytoplasm.

Proteins are essential because they perform a variety of functions in the body, including acting as enzymes, structural components, and signaling molecules, all of which contribute to the expression of specific traits or characteristics. Therefore, the correct answer emphasizes the fundamental role of proteins in determining phenotypes as a result of the genetic information encoded in the nucleus.