Sentences with phrase «gonads began»
The emerging picture that denotes «girlness» or «boyness» reveals the involvement of complex gene networks — and the entire process appears to extend far beyond a specific moment six weeks after gestation when the gonads begin to form.
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Puberty begins when a part of the brain called the hypothalamus begins pumping out gonadotropin - releasing hormone (GNRH) which in turn prompts the gonads to develop and the body to change.
Even though chromosomes mark the cells as male or female, they don't head down that path until after the gonads — testes in a male, ovaries in a female — begin developing and secreting hormones at about 7 weeks.
A few hours after fertilization, the future sex cells begin to head toward the nascent gonads.