Biology
Girls develop female characteristics by inheriting two X chromosomes (XX), one from each parent.
About one in a thousand girls have a 47,XXX karyotype, and one in 2500 have a 45,X one.
Girls typically have a female reproductive system. Some intersex children with ambiguous genitals, and biologically male transgender children, may also be classified or self-identify as girls.
Read more about this topic: Girl
Famous quotes containing the word biology:
“Nothing can be more incorrect than the assumption one sometimes meets with, that physics has one method, chemistry another, and biology a third.”
—Thomas Henry Huxley (1825–95)
“The “control of nature” is a phrase conceived in arrogance, born of the Neanderthal age of biology and the convenience of man.”
—Rachel Carson (1907–1964)
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