A study from Cambridge University in the UK has found that in some populations the survival rate of a granddaughter living in the same house as her paternal grandmother is higher than if she were just living with her immediate family.
But the grandmas did not have such a positive effect on their grandsons.
The lead researcher Molly Fox told reporter Barbara Miller that the findings add to the understanding of what's known as the grandmother effect.
MOLLY FOX: What the grandmother hypothesis basically says is that if a grandmother helped provision her grandchildren while they are toddlers and they're weaned but they are still sort of helpless, she can increase her genetic contribution to future generations.
BARBARA MILLER: Why only grandmothers? Why not grandfathers?
MOLLY FOX: Oh, because men can reproduce until the day they die. They can have a baby on their death bed and grandmothers basically have 50 years as, you know, that's how long eggs live. So if you are going to keep on living then it is going to be without making any babies of your own.
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