Obstetric and Gynecological Nursing - The Carter Center

they share one placenta and one chorion. A few have two
chorions. There is a connection between the circulations of
blood in the two babies. Finger and palm prints are identical.
Errors in development are more likely in monozygotic twins
and conjoined twins are more common.
6.1.2 Dizygotic (Binovular) Twins
Diazygotic or double ova twins develop from the fertilization of
two ovum and two spermatozoa and are more common than
monoazygotic twins.
These twins have two placenta may be fused to form one
amniotic sacs, two chrions and no connection between fetal
circulations. The babies may or may not be of the same sex
and their physical and mental characteristics can be as
different as in any members of one family.
Table 5. Difference between monozygotic and dizaygot twins
Monozygotic(Uniovular) twins Dizaygotric(binovular) twins
One ovume
Two ovum
One spermatozoa
Two spermatozoa
One placenta
Two placenta(mat be fused)
One chorion(few have two) Two chorions
Two amnion
Different sexes orsame sex
Same sex
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