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Development of the reproductive organs and secondary sex characteristics
development of secondary male sexual characteristics Gene Ontology Term (GO)
The adolescent spurt in skeletal and muscular dimensions is closely related to the rapid development of the reproductive system that takes place at this time. There are a few boys, it will be noticed, who do not begin their spurts in height or penis development until the earliest maturers have entirely completed theirs. At ages 13, 14, and 15 there is an enormous variability among any group of boys, who range all the way from practically complete maturity to absolute preadolescence. The same is true of girls aged 11, 12, and The psychological and social importance of this difference in the tempo of development, as it has been called, is great, particularly in boys.
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The sample included white, African American, and Mexican American boys. All 3 groups were significantly taller and heavier than boys in previous NHANES reports and showed earlier genital maturation and pubic hair growth than previous studies based on Tanner staging. Additional studies are required to further evaluate these findings and to explore the public health implications. In , a study on girls found significant differences in the age of onset of pubertal characteristics by race and also found that the mean age of onset was younger compared with findings from the last 30 to 40 years.
Puberty is the stage during which people reach full reproductive ability and develop the adult features of their sex. In boys, puberty usually occurs between the ages of 10 and 14 years. However, it is not unusual for puberty to begin as early as age 9 or to continue until age At puberty, the testes increase testosterone production.