Free download and read ebooks online Digit Ratio - A Pointer To Fertility, Behavior, And Health by John T. Manning full book PDF ePUB Audiobook. Download a free ebooks and kindle audiobook Digit Ratio - A Pointer To Fertility, Behavior, And Health with ISBN id 9780813530307 full page with book summary. John T. Manning book PDF ePUB of Digit Ratio - A Pointer To Fertility, Behavior, And Health published by Rutgers University Press in 2002. Digit Ratio released with category Science with total 173 pages.
📖 Digit Ratio - A Pointer To Fertility, Behavior, And Health by John T. Manning free book pdf
Could the length of your fingers indicate a predisposition to breast cancer? Or musical genius? Or homosexuality? In Digit Ratio, John T. Manning posits that relative lengths of the second and fourth digits in humans (2D:4D ratio) does provide such a window into hormone- and sex-related traits. It has been known for more than a century that men and women tend to differ in the relative lengths of their index (2D) and ring (4D) fingers, which upon casual observation seem fairly symmetrical. Men on average have fourth digits longer than their second digits, while women typically have the opposite. Digit ratios are unique in that they are fixed before birth, while other sexually dimorphic variables are fixed after puberty, and the same genes that control for finger length also control the development of the sex organs. The 2D:4D ratio is the only prenatal sexually dimorphic trait that measurably explains conditions linking testosterone, estrogen, and human development; the study of the ratio broadens our view of human ability, talent, behavior, disposition, health, and fertility. In this book, Manning presents evidence for how 2D:4D correlates with traits ranging from sperm counts, family size, musical genius, and sporting prowess, to autism, depression, homosexuality, heart attacks, and breast cancer, traits that are all linked with early exposure to sex hormones.
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