If a father has blood typeA(IAIO) and single-layered eyelid,and a mother has blood type AB and
double-layered eyelid (Ee).A. What’s the possibility of their child having bothbloodtypeAAND
single-layered eyelid.(2points)B.What’sthepossibilityoftheirchildhavingbloodtypeABand
double-layered eyelid?(2points)C.What’spossibilityoftheirchildhavingbloodtypeBOR
double-layered eyelid?（2points）(You MUST write down your process of deduction,e.g.drawing
Punnett square).
Answers
Answer:
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Explanation:
Genotype of a child with AB blood group is I
A
I
B
. A parent with A blood group can have two possible genotypes: I
A
I
A
and I
A
I
O
, similarly parent with B blood group can have two possible genotypes: I
B
I
B
and I
B
I
O
. If both the parents are homozygous (I
A
I
A
x I
B
I
B
), all of their children will have AB blood group. But, if father is heterozygous (I
A
I
O
) and mother is homozygous (I
A
I
A
); the total different types of possible combinations by three allele (I
A
, I
B
and I
O
) will be (I
A
I
B
and I
B
I
O
). Thus, their children show 50% probability for a blood group AB. But, if mother is heterozygous (I
B
I
O
) and father is homozygous (I
A
I
A
), the total different types of possible combinations by three allele (I
A
, I
B
and I
O
) will be (I
A
I
B
and I
B
I
O
. Thus, their children also show 50% probability for a blood group AB. This means that 50% probability for blood group 'AB' children from father with A and mother with blood group B indicates that either of the parent is heterozygous.
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