有一印度男子为B型血,女子为O型血,他们的孩子中A、B、AB、O型都有,解释其原因.写出推断过程.
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有一印度男子为B型血,女子为O型血,他们的孩子中A、B、AB、O型都有,解释其原因.写出推断过程.
有一印度男子为B型血,女子为O型血,他们的孩子中A、B、AB、O型都有,解释其原因.写出推断过程.
有一印度男子为B型血,女子为O型血,他们的孩子中A、B、AB、O型都有,解释其原因.写出推断过程.
In this quesiton,the key point is that this couple is from india!
In india,there is a genetic phenomenon called Bombay phenotype,which is associated with blood type.
In human's bloodtype,there is a precursor sugar molecule being processed first by an enzyme called alpha-(1,2)-fucosyltransferase.Then,the processed sugar moiety can be attached to antigen that decides the blood type.If the sugar is not properly process,no antigen can be incorporated into the plasma membrane.As a result,the phenotype is O.
In your question,the woman has a Bombay genotype,that is,its alpha-(1,2)-fucosyltransferase gene is homozygous recesssive,but its true blood type is AO.
The man has at least one functional alpha-(1,2)-fucosyltransferase gene.so there children will not have Bombay phenotype,and there blood type can be expressed.Then,the rest is just Mendelian genetics.
Understand?
应该有A，B，O型，而没有AB型，你是不是弄错了。
答：只有B型、O型的子女。解析：B型血的基因型是IBIB或IBi，O型血的基因型为ii，他们结合生育的子女中有IBi，ii，所以是B型或O。而没有A型、AB型，如果有，哪一般是领养的。或是基因突变产生的。
女子的O型不是普通的O型，不然应该只会产生O或B型的后代