大师作文网有一印度男子为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.
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?
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?
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.
一道生物学考研题：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.
血型分别是O,A,B,AB的四个孩子,其父母血型为O与O,AB与O,AB与,B与B,请为孩子找父母
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1．人类ABO血型系统中,有A型,B型,AB型,O型四种类型.试分析均能生出O型血孩子的是( A ) ①A型×O型 ②