Mothering matters, but grandmothering counts too

 作者:赫连妣     |      日期:2019-03-08 05:03:07
WHY women evolved to live so far beyond their reproductive years is a mystery long debated. Now there is new evidence backing the “grandma hypothesis” – that they stick around to invest in their grandchildren, safeguarding the genes they share. Leslie Knapp and her team at the University of Cambridge reasoned that if the hypothesis is true, how much grandma invests in her grandkids should depend on the proportion of genes they share. So they came up with a way to test this. Due to the way X chromosomes are transmitted,