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paternal grandmom gives one x chromosome to both grand sons and daughters....but which x chromosome ? her fathers or mothers x chromosome ? to the grandson she gives her fathers x chrom. to the granddaughter her mothers x chromosome.
Do grandparents favor granddaughters? Biased grandparental investment in UK
Antti O. Tanskanen'Correspondence information about the author Antti O. Tanskanen, Anna Rotkirch, Mirkka Danielsbacka
See this 2011 study which did not support the conclusions when developed societies were studied. Your article should have made this distinction. Life is very different in tribal and other less "developed" societies.
Differential grandparental investment in grandchildren is often explained with paternity uncertainty. The asymmetric inheritance of the sex chromosomes, especially of the X chromosomes, may also bias grandparental investment. Recent studies show that ignoring the sex of the grandchild can mask important differences in the investment patterns of the same grandparent category, but this has not been tested in contemporary societies with nationally representative data. With 17 variables from the Involved Grandparenting and Child Well-Being 2007 survey, we tested differential grandparental investment as reported by British and Welsh adolescents and compared predictions based on X-chromosomal relatedness with predictions based on paternity uncertainty. The theories are expected to differ with regard to grandmaternal investment in grandsons and granddaughters. We test whether paternal grandmothers invest (H1) more in granddaughters than in grandsons, (H2) more in granddaughters than maternal grandmothers do and (H3) less in grandsons than maternal grandmothers do. In addition, following the suggestion that paternal grandmothers may reduce sibling competition between girls and boys by harming grandsons, we study whether (H4) paternal grandmothers channel more noninvestment into grandsons than into granddaughters. The results show no convincing support for the type of sex discrimination of grandchildren that is predicted by X-chromosomal relatedness theories, but do provide support for the paternity uncertainty theory. X-chromosomal relatedness does not appear to shape grandparental behavior in developed societies.
My maternal grand mother passed away when I was just 2 years old, so I didn't get the chance to know her. My paternal grand parents were really close to me and my other siblings. Since my dad was the only son of his parents, they wanted him to live with them after he married my mother, so we were a joint family. We lived on the top floor of our house, and my grand parents lived on the ground floor. We had lunch and dinner together every day on the ground floor with my grand parents, that's the reason why we were so close to them, and received so much love and attention from them
My grandmother was an excellent cook. She would take a lot of trouble to make o very special lunch and dinner every day. We had a cook always, but she would tell him how she wanted each dish prepared. She spent a lot of time making sure that everyone at home was happy and satisfied with whatever she did. Her cake making, deserts and pies were out of this world. She was such a giving, loving person, that so many of our relatives would drop in just before lunch, because they knew they would be most welcome in our house. I remember my grand mother for her very caring and thoughtful ways. She looked after us so lovingly and everyone who knew her, loved her for her giving and caring nature. Till today, there are so many who have had the good fortune of knowing her and her generosity, will never fail to mention about the special food she cooked for them, or how she always went out of her way to make people happy.
My grandmother was very, very special. A rare and precious gem of a person. She is missed by many.
yes. I had chance to be close with my maternal grandma. My paternal grandma died before my birth. So i don't have experience with her. Like that my daughters. My grandchildren also with me. They are more attached to me.. i agree
This article is crap! It doesn't matter where the chromosomes come from. Paternal grandparents love and care for and are as close to their grandchildren as are the maternal grandparents. I have both grandchildren from my son and a grandchild from my daughter. I see no difference. I feel no different. I dont feel they treat me any differently!
Yes, X chromosome/X linked inheritance is from maternal side only.
However, this article is misleading in saying that paternal grandmothers do not contribute to their grandson's gene pool. That is incorrect, scientifically. A male child could inherit (the good and the bad, quirky traits, health risks, etc) from all four grandparents.
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