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A set of twins made up of a boy and a girl results when two ova were respectively fertilized by two spermatozoa...
each carrying both an X and a Y chromosome
each carrying a Y chromosome
each carrying two X chromosome
each carrying two Y chromosome
one carrying a Y chromosome and the other a X chromosome
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ExactKnowledge: A set of twins made up of a boy and a girl results when two ova were respectively fertilized by two spermatozoa...
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