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A few years ago, Michael Gabbett got a call from a very confused ob-gyn. A woman had come in pregnant with twins who should have been identical—they shared a placenta, meaning they must have split from a single fertilized egg.
But doctors could also see, as plain as day on the ultrasound, that one looked like a boy, and the other, a girl. How could the twins be identical but different sexes? So he began to dig. These twins in Australia are the second known case. Read: When a DNA test shatters your identity. The sesquizygotic twins are likely the result of three separate events in the womb, each one rare by itself. First, an egg was fertilized by two sperm, one with an X chromosome, and one with a Y. The usual result is a fetus with three sets of chromosomes rather than the normal two.
These fetuses do not survive. In this case, however, a second unusual thing probably occurred. It seems that the three sets of chromosomes egg, X sperm, and Y sperm were able to sort themselves into three types of cells. Two of these cell types were more typical; they each contained one chromosome set from Mom the X through the egg and one from Dad the X or Y from the sperm. The third type only had chromosomes from Dad, one from the X sperm and one from the Y sperm.
This last type of cell cannot grow normally. But the two more typical cell types continued to divide and divide as a single ball. Lastly, this ball of cells split to create two embryos. One grew in the womb to look like an ordinary girl, and the other like an ordinary boy. Genetically, however, the twins were not so ordinary. The ball of cells had not split neatly into an XX and an XY embryo.
