May 10, 2010
Grandparents can't help having favourites - they prefer the grandchildren with whom they share the most DNA, research suggests.
The phenomenon explains studies that have shown a paternal grandmother benefits her granddaughters' health more than grandsons.
This is because a woman passes around 31 per cent of her genes to her son's daughters but just 23 per cent to her son's sons - suggesting a protective effect for the grandchildren they are most closely related to.
The article also helpfully adds:
A woman always knows she is the mother of her child but a man has some uncertainty about his paternity because he might have been cuckolded.
Read more here.
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