Wrong and blatantly so. Moreover, it's obfuscating: The hormones we make and respond to in our bodies is genetically encoded--our bodies and brains are built from genes--the insides and the observable outsides. Our brain is affected by multiple chemicals--proteins--encoded for in genes. Without genes--there is no body...no brain...no mental traits and no physical phenotype that can be observed. If you don't think nature can select for mental traits then your understanding of science such as the way we selected dogs from wolves is extremely inadequate--and blindingly so. Long before there were observable data--genes were coding for things going on inside the body and brain--and those things are NOT phenotypic. Shame on you for trying to pass this crap off
And we know quite well, that sexual selection produces phenotypic byproducts. But these phenotypic byproducts evolved because they happened to be associated with the healthier (or more reproductively fit) of each species. It is theorized that men developed language because the better communicators got laid more. What goes on in a brain is not "phenotypic"--the resulting behavior change may be.
Articulett, thank you for posting in response to me but I do find it difficult to reply to you. You have ten postings here and, to some extent or other, I would disagree with most of them, so I shall just concentrate on sexual selection.
The description I give of sexual selection is, in essence that given by Darwin in the Descent of Man, which included "selection by means of sex" (or some such) in the subtitle. If you are unsure of the difference between natural selection and sexual selection, you might consider looking at "The Origin of Species" and "The Descent of Man" and comparing the selective mechanisms that Darwin was proposing. Sexual selection was further mentioned by Fisher and has been extensively analysed by many people since.
In sexual selection, the selection of a sexual partner cannot possibly be made on the basis of genotype because genotype is not an observable, except to scientists. Only aspects of phenotype are observable and, for many species, that phenotype being observed may seem quite arbitrary, such as the length of the peacock's tail. Nonetheless, peahen's do use tail length as one of their decision criteria to determine mating.
Sexual selection seems to offer a faster mechanism of evolutionary change than does natural selection but it is also thought capable of causing runaway evolutionary processes. Hence one has the sight of peacock's carrying around a tail that certainly does not enhance that individual's immediate life chance – it is the mere chance of female sexual preference that has led to the male's tail. Hence, it seems likely that sexual selection can lead to rapid extinction as well as to rapid evolutionary adaptation.
Now, as you know, I am interested in describing evolution in terms of data, rather than in terms of genes. You are free to think that a silly thing to do, but I am free to disagree with you. I think it is a sensible thing to do and the point I am making about sexual selection is that this form of selection involves data that originate in sensory data not just in DNA. Therefore, that this sensory data must be subject to data processes that will gather, interpret and make selections based on sensory data. Thus sexual selection on a peacock does not drive merely the length of the peacock's tail, it also drives the peahen's ability to gather this sensory data, to interpret that data into information about tail lengths and the identity of prospective suitors, to store that information so as to enable comparison and to make a selection between the observed individual suitors. In other words, sexual selection, as a mechanism, will drive the development of sense organs and brains. This is why Darwin thought sexual selection to be relevant to the evolution of the brain. I think he was right, though his mechanism applies to a great many species, not just to humans. With humans, I think one has to add other factors, particularly social factors.
Nonetheless, sexual selection seems an important factor in human evolution – it is not woo, and it does involve data that is not on DNA.