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" ... Making the best out of a very strange thing, the resulting cell with three pairs of chromosome sets went about some unusual allocations. One of the X-bearing maternal chromosome sets joined up with one of Y-bearing sperm sets. The other X-bearing maternal set joined forces with the X-bearing sperm set. The result: cells bearing an XX signature and cells bearing an XY combination. Left out in the cold: the remaining two sperm chromosome sets, one X and one Y. They may well have made a valiant effort, but paternal–paternal chromosome pairings fail embryonically in mammals. ... "