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monozygotic
one fertilized ovum divides
dizygotic
two separate ova are fertilized by separate sperm
TWINS
monochorionic and monoamniotic
one chorionic and one amniotic sac
this is the highest risk of pregnancy
monochorionic and diamniotic
one chorion and two amniotic sacs
dichorionic and diamniotic with fused placentas
separate chorions and sacs, placentas are fused
dichorionic and diamniotic with separate placentas
this is a safer pregnancy
what are the maternal effects of twins
increased cardiac workload
respiratory discomfort
overall physiological demands