Human male and female are phenotypes
May 5, 2005 Dov, in biologicalEvolution
(A) From Scientific American, May 2005, p.22, "His Brain, Her Brain", By L. Cahill :
* "It turns out that male and female brains differ quite a bit in architecture and activity."
* "Neuroscientists are uncovering anatomical, chemical and functional differences between the brains of men and women".
* "Several intriguing behavioral studies add to the evidence that some sex differences in the brain arise before a baby draws its first breath".
(B) Two of the many definitions of "phenotype":
* "The detectable expression of the interaction of genotype and environment constituting the visible characters of an organism".
* "The observable characteristics, appearance or constitutional, of an organism due to the interaction between the genotype and the environment."
(C) I am not well informed in the matters of the subject article but plain common sense, without need to resort to verbiage, suggests that a comparison of organism's male's and female's genomes reveals, or would most likely reveal, a set of expressions of genes of different patterns, evolved in the course of different physiological adaptive demands/preferences of male and female.