What Determines a Male?
Country: United States
Date: September 2005
When did science actually find out about the male determining
the sex of the child?
The Y chromosome was discovered in fruit flies by Thomas Hunt Morgan
circa 1910. Up until 1956, the number of chromosomes in humans was
thought to be 48, but improved methods of observing chromosomes
microscopically revealed that there were actually only 46 chromosomes
in humans. I wasn't able to determine the exact year in which human
females carry 2 X xhromosomes and males only one plus a Y chromosome.
Ron Baker, Ph.D.
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Update: June 2012