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We reported similar findings in gynecomastia in man. Taller stature is largely a result of later puberty and slower epiphyseal fusion. From Wikipedia, the free encyclopedia. Webarchive template wayback links Articles needing POV-check from December Articles needing additional references from December All articles needing additional references. Male birds and fish of many species have brighter coloration or other external ornaments. In humans, visible secondary sex characteristics include pubic hair , enlarged breasts and widened hips of females, and facial hair and Adam's apple on males. It is therefore proposed that gynecomastia probably results from failure of adequate testosterone action on the breast primordia during embryonic differentiation.

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However, fetal or neonatal androgens may modulate later breast development by reducing the capacity of breast tissue to respond to later estrogen. National University of Singapore. The general structure and shape of the body and face, as well as sex hormone levels, are similar in preadolescent boys and girls. This idea is known as the good genes hypothesis.

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British Journal of Obstetrics and Gynaecology. Thus, this boy demonstrates that breast development may occur in postpubertal males if the programing of the pubertal sex differentiation of the mammary gland anlagen is disturbed by an enzyme defect which causes a failure of fetal testicular testosterone production. The handicap principle extends this idea, pointing out that a peacock's tail, for instance, displays fitness by being a useless impediment that is very hard to fake. Differences in size between sexes are also considered secondary sexual characteristics.

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Description: Ronald Fisher , the English biologist developed a number of ideas concerning secondary characteristics in his book The Genetical Theory of Natural Selection , including the concept of Fisherian runaway which postulates that the desire for a characteristic in females combined with that characteristic in males can create a positive feedback loop or runaway where the feature becomes hugely amplified. Thus, this boy demonstrates that breast development may occur in postpubertal males if the programing of the pubertal sex differentiation of the mammary gland anlagen is disturbed by an enzyme defect which causes a failure of fetal testicular testosterone production. Sexual selection in human evolution. We reported similar findings in gynecomastia in man. Another of Fisher's ideas is the sexy son hypothesis , whereby females will desire to have sons that possess the characteristic that they find sexy in order to maximize the number of grandchildren they produce. British Journal of Obstetrics and Gynaecology.
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