Human evolution theory utilizing concepts of neoteny & female sexual selection
An etiology of neuropsychological disorders such as autism and dyslexia, and the origin of left handedness.
"Where descent is in the female line, as it was universally in the archaic period, the gens is composed of a supposed female ancestor and her children, together with the children of her female descendants, through females, in perpetuity..." (Morgan, L. H. (1877) Ancient Society. Macmillan: London p. 63)
"The gens, though a very ancient social organization founded upon kin, does not include all the descendants of a common ancestor. It was for the reason that when the gens came in, marriage between single pairs was unknown, and descent through males could not be traced with certainty. Kindred were linked together chiefly through the bond of their maternity. In the ancient gens descent was limited to the female line. It embraced all such persons as traced their descent from a supposed common female ancestor, through females, the evidence of the fact being the possession of a common gentile name. It would include this ancestor and her children, the children of her daughters, and the children of her female descendants, through females, in perpetuity; whilst the children of her sons, and the children of her male descendants, through males, would belong to other gentes; namely, those of their respective mothers. Such was the gens in its archaic form, when the paternity of children wa not certainly ascertainable, and when their maternity afforded the only certain criterion of descents." (Morgan, L. H. (1877) Ancient Society. Macmillan: London p. 68)
"In the consanguine family, thus constituted, the husbands lived in polygyny, and the wives in polyandry, which are seen to be as ancient as human society. Such a family was neither unnatural nor remarkable. It would be difficult to show any other possible beginning of the family in the primitive period. Its long continuance in a partial form among the tribes of mankind is the greater cause for surprise; for all traces of it had not disappeared among the Hawaiians at the epoch of their discovery." (Morgan, L. H. (1877) Ancient Society. Macmillan: London p. 409)