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Articles on Multiple births

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Semi-identical twins share all the DNA passed on from their mother, but only a portion from their father. From shutterstock.com

Same same but different: when identical twins are non-identical

Semi-identical or sesquizygotic twins occur when two sperm fertilise one egg. A boy and a girl in Brisbane are only the second set of semi-identical twins known in the world.
The Good sisters, born in Bristol in 1948, were the first quadruplets in the world to survive a caesarean-section birth. Paul Townsend

Explainer: twins, triplets, quadruplets and more

Are they twins? Are they identical? Are they natural? Which one is older? These are some of the all-too-familiar, somewhat invasive and highly personal questions posed by well-intentioned strangers to…

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