Phenotypic Sex is Determined at the Moment of Fertilization

Question

Phenotypic sex is determined at the moment of fertilization.

Accepted Answer

Phenotypic sex, which refers to the physical and physiological traits of an individual, is influenced by the expression of genes and the action of hormones during development, not determined solely at the moment of fertilization. Fertilization determines the genetic sex (XX or XY chromosomes) but phenotypic sex develops later.