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Unformatted text preview: time when an egg is split it will produce the same sex, but not always. On rare occasions the XX and XY chromosomes will make a male and a female. In any of these multiple births the babies the babies can either share the same sack, or have their own sacks, as well as the can share the same umbilical chords, or they may have their own umbilical chords. In the case of the odds for having multiple births race does take a role. For Asians the odds are 1 400, in Whites the odds are 1 88 and for Indians the odds are 1 25. Older women and the rate of sex can also play a role in this as well. The first organ to form is the heart. Embryos have gills and a tail for the first month. 1 400 fraternal twins are from different fathers....
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This note was uploaded on 12/20/2010 for the course SOC 101 taught by Professor Sullivan during the Spring '08 term at ASU.
- Spring '08