Twins
Twins occur in 1 in 105 births in the UK.
Twins may be polyzygous (binovular; twins that develop from two separate ova that were fertilised at the same time) or monozygous (uniovular; twins that develop from the same ova).
Polyzygous twins are termed non-identical twins. These twins never share the same amnion, chorion or placenta. There may, however, be fusion of separate placentae.
The incidence of binovular twins is three times that of uniovular twins.
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