Which of the following best describes the development of sexual structures in mammals?
A. Embryos develop male structures only
once the SRY gene on the Y chromosome.
becomes active; if SRY is not present, they
develop female structures.
B. Embryos initially develop female
structures, but these degenerate and male
structures develop once SRY becomes
active.
C. Embryos initially develop both male and
female structures; once SRY becomes active,
female structures degenerate and male
structures continue to develop.
D. Embryos initially develop male structures;
if SRY is not present, these degenerate and
female structures develop. If SRY is present,
they continue to develop.
E. None of these accurately describes the
development of sexual structures in
mammals.
C
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