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Undertoad · 03-10-2009, 02:22 PM

The zygote/fetus is male or female from the start due to presence of XX female or XY male chromosome.

03-10-2009, 02:22 PM	#544
Undertoad Radical Centrist Join Date: Jan 2001 Location: Cottage of Prussia Posts: 31,423	The zygote/fetus is male or female from the start due to presence of XX female or XY male chromosome.