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twin sisters
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Twin Sisters

Due to the limited size of the mother's womb, multiple pregnancies are much less likely to carry to full term than single births, with twin pregnancies lasting only 37 weeks (3 weeks less than full term) on average.
Zygosity
Zygosity is the degree of identity in the genome of twins. There are five common variations of twinning. The three most common variations are all fraternal (dizygotic):

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Keywords:#twin #sisters
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Date added:Feb 03, 2012
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