stupid dog leads clever sheep flock, such a world
读《My sister's keeper》
作者：laiyinhate_xie 提交日期：2007-7-2 17:54:00 | 分类:E文 | 访问量：897
My sister's keeper
A woman with a twin brother has fewer brother.
A woman with a twin brother is more masculine than she would if she was born alone.Their teeth are bigger,perform better on spatial- ability test.squarer, more masculine jaws and but more likely to be short-sighted.
Now the study shows, girls with a twin brother perform worse on sexual reproduction than other females.
Virpi Lummaa ，英国Sheffield大学的教授称，他们发现龙凤胎中的女士的结婚率要比双凤胎的少15%；而生孩子的几率要少25%，即使她和双凤胎的活得一样长。
Virpi Lummaa,prof.in Sheffield Uni. claimed , they discovered that women with a twin brother were 15% less likely to get married than were women with a twin sister and also had 25% lower chance of giving bith even though they live as long as those with a twin sister.
Lummaa ,to rule out any influence of other elements,he specifically picked women whose brother died before 3 months old.
Prof.Lummaa think that the cause of this influence is testosterone.When girl with his twin brother is in the womb,hormone her brother's developing testes made can enter her body through amniotic fluid,influencing her growth.But whether this hormone will influce the girl's reproductive ability is not clear.
Lesbianism is another possibility.But with interventions from many social classes ,scientists have no more data to check.
Lummaa suggests that women would do better to avoid producing pairs of twins consisting of one boy and one girl.Because study shows Mothers who produced opposed-sex twins had 19% fewer grandchildren than did mothers who gave birth to same-sex twins.
Evolutionary theory predicts that the chances of giving birth to pairs of boy-and-girl are fewer than those to single-sex pairs.
But In the eyes of God ,unlike those of natural selection,twin girls are created equal.