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The notion that sex could be determined by chromosomes was a new idea. Prior to Henking, McClung, and Sutton's reports, sex determination was attributed to factors other than gametes, such as the environment in which egg cells existed.
How a Babyâs Gender is Determined. Females have an XX pair of sex chromosomes, and males, an XY pair. A babyâs gender is determined by the sperm cell that fertilizes a womanâs egg.Sperm carry one sex chromosome, either a Y (male) or X (female). To better understand, letâs look at how sperm develop. babyâs gender is determined by the sperm cell that fertilizes a womanâs egg. Sperm carry one sex chromosome, either a Y (male) or X (female). To better understand, letâs look at how sperm develop.