Secondary sex characteristics in females











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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. We reported similar findings in gynecomastia in man. Advances in the Biosciences. Technical Issues in Reproductive Health. Estrogen also induces growth of the uterus , proliferation of the endometrium , and menstruation. Discuss and resolve this issue before removing this message. British Journal of Obstetrics and Gynaecology.

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Female Secondary Sexual Characteristics

This idea is known as the good genes hypothesis. 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. From Wikipedia, the free encyclopedia. Sexual differentiation begins during gestation , when the gonads are formed. Converted into DHT in the skin, it accelerates growth of androgen -responsive facial and body hair but may slow and eventually stop the growth of head hair.

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Secondary sexual characteristics in boys

Male birds and fish of many species have brighter coloration or other external ornaments. Sexual differentiation begins during gestation , when the gonads are formed. Technical Issues in Reproductive Health. Male jumping spiders have visual patches of UV reflectance, which are ornamentations used to attract females. This idea is known as the good genes hypothesis. This section may lend undue weight to certain ideas, incidents, or controversies.

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Description: Archived from the original on Male birds and fish of many species have brighter coloration or other external ornaments. Views Read Edit View history. This idea is known as the good genes hypothesis. Male levels of testosterone directly induce the growth of the genitals , and indirectly via dihydrotestosterone DHT the prostate. Webarchive template wayback links Articles needing POV-check from December Articles needing additional references from December All articles needing additional references. It is concluded that androgens normally prevent the development of nipples and extensive formation of mammary tissue in male fetuses. They are distinguished from the primary sex characteristics , the sex organs, which are directly necessary for sexual reproduction to occur. Taller stature is largely a result of later puberty and slower epiphyseal fusion.
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