Secondary sex characteristics in females
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As puberty begins and sex hormone levels rise, differences appear, though some changes are similar in males and females. Charles Darwin hypothesized that sexual selection , or competition within a species for mates, can explain observed differences between sexes in many species. 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. 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.
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Female Secondary Sexual Characteristics
It is concluded that androgens normally prevent the development of nipples and extensive formation of mammary tissue in male fetuses. Sexual differentiation begins during gestation , when the gonads are formed. 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. Namespaces Article Talk. Unsourced material may be challenged and removed. Breast tissue of adult male Holtzman rats exposed to cyproterone acetate during embryonic differentiation showed presence of specific estradiol receptor proteins and C steroid aromatase. This idea is known as the good genes hypothesis.
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Secondary sexual characteristics in humans
Retrieved from " https. This section may lend undue weight to certain ideas, incidents, or controversies. Charles Darwin hypothesized that sexual selection , or competition within a species for mates, can explain observed differences between sexes in many species. Male levels of testosterone directly induce the growth of the genitals , and indirectly via dihydrotestosterone DHT the prostate. As puberty begins and sex hormone levels rise, differences appear, though some changes are similar in males and females.
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