EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
False colour ultrasound image of the womb of a pregnant woman showing twins, a natural occurrence in 1 in 80 pregnancies. The introduction of the so-called fertility drugs (eg Clomiphene), which stimulate the production of ova, has increased the number of multiple births. Twins may be binovular or uniovular: binovular, or fraternal, twins result from 2 ova being released & both being fertilised, developing separately in the womb & may be of either sex. Uniovular (identical) twins arise from a single ovum which splits after fertilisation; they are of the same sex, physically alike & possess similar mental characteristics. Original is B/w print M805/064.
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