Twins may be derived from a single egg (monozygous,
identical) or two separate eggs (dizygous, fraternal).
Examination of the placenta and membranes may help to
distinguish between monozygous and dizygous twins but is not
completely reliable. Monozygosity, resulting in twins of the
same sex who look alike, can be confirmed by investigating
inherited characteristics such as blood group markers or DNA
polymorphisms (fingerprinting).
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