Puberty-timing is everything!

Belinda Pinyerd1, William B Zipf

  • 1Central Ohio Pediatric Endocrinology and Diabetes Service, Columbus, 43231, USA. bwresearch@columbus.rr.com

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Freud's psychosexual...
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The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
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Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Timing and Consequences on Behavior

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