The single gene that is responsible for sex determination is the ____________________ region of the ____________________ chromosome.
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Q220: Estrogen stimulates duct development in the breasts.
Q221: The four phases of the sexual cycle
Q222: The hormone _ in males and the
Q223: An undescended testis is known as a(n)
Q224: A surge in _ secretion from the
Q226: The embryonic _ gives rise to the
Q227: A(n) _ is the cutting and tying
Q228: The three major stages of spermatogenesis are
Q229: The primary sex organs secrete sex hormones,
Q230: The _ of the testes secrete testosterone
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