How Is Sex Determined? Introduction The following screens mainly show the development of the gonads -- the two areas in the embryo that will become either testes or ovaries. Next: Conception Printer-Friendly Format   Feedback My Life as an Intersexual | Share Your Story | Two Sexes Are Not Enough The Intersex Spectrum | How Is Sex Determined? | Resources Transcript | Site Map | Sex: Unknown Home Search | Site Map | Previously Featured | Schedule | Feedback | Teachers | Shop Join Us/E-Mail | About NOVA | Editor's Picks | Watch NOVAs online | To print PBS Online | NOVA Online | WGBH © | Updated October 2001