10. d. The urethra and the genital tract remain separate
Work Step by Step
In males, the urethra and the genital tract are not separate. This is due to the action of the SRY gene on the Y chromosome. If the SRY gene is not present in an embryo --as in a female embryo-- the urethra and the genital tract remain separate in development. In females the genital tract opens at the vaginal vestibule; the urethra has a separate opening--the external urethral orifice.