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If the sperm gamete that fertilizes an egg has a(n) _____ chromosome, it will form female offspring. X Y XY XX

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Xx - female. Xy - male. egg already has an X chromosome so it depends on the other. If second one is X than it's a girl. If Y - a boy
If the sperm gametes that fertilizes an egg has an XX chromosomes, it will form female offspring. X is a female, XY is a female, Y is a male and XX is a female.

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