A child is born with a blood group A. With help of a cross show the possible blood group of its
parents.
Answers
Answer:
B or Ab or A
blood group is
Answer:
blood group is A,Band ab
Explanation:
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The possible blood groups of children born to parents having A and AB groups are
Hard
Solution
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Correct option is B)
Human blood group inheritance is the example of codominance and multiple alleles. It is governed by three alleles namely I
A
, I
B
and I
O
. I
A
and I
B
show codominance while allele I
O
is recessive to both I
A
and I
B
.
The genotype of a person with “A” blood group can be I
A
I
O
or I
A
I
A
and that of the parent with AB blood group is I
A
I
B
. The alleles I
A
, I
O
and I
B
can make three genotypic combinations, namely I
A
I
A
, I
A
I
O
, I
A
I
B
and I
B
I
O
. Thus, the possible blood group of their children is A, B and AB. To have a child with O blood group, both parent should have at least one I
O
allele; thus they can’t have a child with O blood group.
Cross 1
Parent generation : I
A
I
A
x (I
A
I
B
)
Gametes :
I
A
I
A
-->
(I
A
I
B
)
I
A
I
A
I
A
I
A
I
A
I
A
I
A
I
B
I
A
I
B
I
A
I
B
F
1
generation phenotypic ratio = 1 A group : 1 AB group
Cross 2
Parent generation : I
A
I
O
x (I
A
I
B
)
Gametes :
I
A
I
O
-->
(I
A
I
B
)
I
A
I
O
I
A
I
A
I
A
I
A
I
O
I
B
I
A
I
B
I
B
I
O
F
1
generation phenotypic ratio = 2 A group : 1 AB group : 1 B group