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In the process, the nucleus of an egg is inserted into the cytoplasm of an egg from a donor female which has had its nucleus removed, but still contains the donor female's mtDNA. The composite egg is then fertilized with the male's sperm.
How a Babyâs XX Gender or XY 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).