The Y chromosome of the male embryo instructs it to secrete testosterone, causing the indifferent gonad to create testes.

Name: The Y chromosome of the male embryo instructs it to secrete testosterone, causing the indifferent gonad to create testes.
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The presence of the Y chromosome in the male embryo signals the formation of testes, which then produce and secrete testosterone. This hormone is responsible for the development of male sexual characteristics during fetal development.

The Y Chromosome of the Male Embryo Instructs It to Secrete