Yeh provided several lines of evidence indicating that selection, rather than genetic drift or plasticity, was responsible for the observed change in this signalling trait.
Previous page Increase in body size.
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To measure developmental age, there is need of some way of determining how far along his own path to maturity a given child has gone.
Other areas of the body may be used if required.
The effects are most dramatically seen at adolescence, but they are present at all ages from birth and even before.
Models of sexual selection have provided us with a theoretical framework to expect rapid evolution of secondary sexual traits in natural populations.
Figure 1 and Figure 2 show the prevalences of pubic hair and genital development, respectively, at Tanner stage 2 or later by age for whites, African Americans, and Mexican Americans.
Arch Pediatr Adolesc Med.
The other relationships described regarding differences in ages of being in each stage for breast and pubic hair development and the length of time between stages showed no significant relations with race.
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