s********r
发帖数: 663 | 1 美国这儿唐氏儿的比率特高，据说800分之一。听说男人35岁后，生第一个娃的概率更
高很多。不知是不是真的？ |
d****o
发帖数: 1185 | |
e****a
发帖数: 4783 | 3 第一句跟第二句您都是哪儿听来的？
【在 s********r 的大作中提到】
: 美国这儿唐氏儿的比率特高，据说800分之一。听说男人35岁后，生第一个娃的概率更
: 高很多。不知是不是真的？
|
B******e
发帖数: 5730 | 4 初生儿defect 的比例高
是太多人工帮助怀孕的结果 |
n****n
发帖数: 568 | 5 这个是指女人的岁数。过了35岁生头胎，要多做很多项检查的。
【在 s********r 的大作中提到】
: 美国这儿唐氏儿的比率特高，据说800分之一。听说男人35岁后，生第一个娃的概率更
: 高很多。不知是不是真的？
|
s*******e
发帖数: 4188 | 6 你这个概率题是不是也是mathcounts里出来的 lol |
s********r
发帖数: 663 | 7 跟老美同事聊天时听说的。特别说是弯曲这儿，800个新生儿就一个唐氏儿， 比率特高。
说事的当然是指男性。
女性高龄产妇什么的都是常识了，也没必要在这人罗嗦了。
反正男人得注意。
【在 s********r 的大作中提到】
: 美国这儿唐氏儿的比率特高，据说800分之一。听说男人35岁后，生第一个娃的概率更
: 高很多。不知是不是真的？
|
n****m
发帖数: 1283 | 8 For man, it is not downs. It is something else. |
l*****O
发帖数: 402 | 9 extra copy of chromosome 21 can be from either dad or mom.
mostly it happens during meiosis. so blaming only women makes no sense.
however, statistically, older women tend to marry older men. even some of
them marry men several yrs junior, there is still a very obvious linear
association of wife's age and husband's age.
高。
【在 s********r 的大作中提到】
: 跟老美同事聊天时听说的。特别说是弯曲这儿，800个新生儿就一个唐氏儿， 比率特高。
: 说事的当然是指男性。
: 女性高龄产妇什么的都是常识了，也没必要在这人罗嗦了。
: 反正男人得注意。
|
n****m
发帖数: 1283 | 10 ?
I heard that extra copy of chromosome from man will not generate live baby.
It is more dangerous when they are from woman, because they are live.
【在 l*****O 的大作中提到】
: extra copy of chromosome 21 can be from either dad or mom.
: mostly it happens during meiosis. so blaming only women makes no sense.
: however, statistically, older women tend to marry older men. even some of
: them marry men several yrs junior, there is still a very obvious linear
: association of wife's age and husband's age.
:
: 高。
|
l*****O
发帖数: 402 | 11 too many possibilities. can't predict.
but in reality, one of the defective sperms from a normal man could win
the race several times. there is one literature that describes such a case.
an asian woman had 3 time miscarriage after birth of her first baby. it
turned out that her husband's chromosomes have a balanced translocation. if
this woman gets pregnant infinitive times, she probably will have 25% normal
kids without translocation, 25% noraml kids with translocation, 50%
miscarriage or still birth. but in reality, she's pregnant four times, only
1 live birth.
so a sperm with extra copy of chromosome 21 might win the race too. we never
know.
【在 n****m 的大作中提到】
: ?
: I heard that extra copy of chromosome from man will not generate live baby.
: It is more dangerous when they are from woman, because they are live.
|
