推荐回答(2个)
我国法律规定:三代以内直系血亲不能结婚。
直系血亲是指与自己有直接血缘关系的亲属,即生育自己和自己所生育的上下各代亲属,如祖父母、外祖父母、父母、子女、孙子女、外孙子女等。
旁系血亲是指除直系血亲以外在血缘上和自己同出一源的亲属。三代以内的旁系血亲是出自同一祖父母、外祖父母的旁系血亲。
哪些旁系血亲是三代以内的呢?从自己往上数,自己是第一代,父母为第二代,祖父母、外祖父母为第三代,依此类推。从自己往下数,自己是第一代,子女是第二代,依此类推。计算时,找出自己和某一旁系的最近的共同长辈,然后分别从自己和该旁系向上数至这一共同长辈,如果两边均为三代以内,就是三代以内旁系血亲,如果其中一边超过三代,则予以否定。比如,姨表侄和自己的最近共同长辈是自己的外祖父母,从姨表侄向上数至外祖父母是四代,从自己向上数至外祖父母是三代,那么姨表侄就是自己的第四代旁系血亲,而不是三代以内旁系血亲。据此,三代以内的旁系血亲包括同源于祖父母的叔、伯、姑、姨、舅、兄弟姐妹、堂兄弟姐妹、表兄弟姐妹、侄子、侄女、外甥、外甥女等
超过三代的血缘关系就不算为近亲结婚了
说能的都懂不懂啊?!
你觉得是你觉得的事
国家
生物都是严格规定的!
这绝对算第3代
我给你按照生物学上定义
因为女孩爷爷的爸爸
和男孩姥爷的爸爸是一个人
所以应从女孩的爷爷算起
F1
女孩爷爷
男孩姥爷
F2
女孩爸爸
男孩妈妈
F3
女孩
男孩
所以属于三代
或者还有从女孩这代往上算三代
如果这三代没有重合就不是三代
但是你算算
从女孩开始
女孩爸爸一代
女孩爷爷一代
女孩爷爷的父母
一代
到这代就重合了
所以说明是近亲
你也可以看下这个图
https://gss0.baidu.com/70cFfyinKgQFm2e88IuM_a/baike/pic/item/481517239b79115d925807e5.jpg
这幅图里也有关于概率的
请你计算先隐性基因的问题
这就要说的太远了
简言之
就是比如女孩爷爷的爸爸生下爷爷
携带致病基因概率(1/2)
然后爷爷生下爸爸
致病基因平方
携带致病基因概率
即
(1/4)
爸爸生下女孩
致病基因立方
携带致病基因概率
即(1/8)
以此类推
请你自己算吧
上面是隐形基因
显性基因致病的概率更高
只能解释到这了
不好意思
说的不清楚
希望能够帮到你~
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