Problem: In a family, the mother has blood group A (II) and the two children have blood groups: O (1) and AB (IV). Determine the following: a. The blood group of the children's father; b. Genotypes of parents' blood groups; C. Percentage (%) of descendants who have other groups than their parents.
Answers
Answer:
the blood group of children father is o
Explanation:
ANSWER
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. I
A
and I
B
show codominance while allele "I
O
" is recessive to both "I
A
" and "I
B
". To have a child with B blood group, either both parents should have at least one I
B
allele or one parent should have I
B
allele and other least one I
O
allele. To have a child with AB blood group, one parent should have at least one I
B
allele and other at least one I
A
allele. To have a child with O blood group, both parents should have at least one I
O
allele. Genotype in option A has all three required alleles; I
A
, I
B
, I
O
; these heterozygous parents will form three types of gametes with three different alleles and can have progeny with B (I
B
I
O
), AB (I
A
I
B
) and O (I
O
I
O
) blood group. This is the correct answer. Genotype in option B has I
A
and I
O
allele but I
B
is absent without which parents cannot have a child with B blood group; this is an incorrect answer. Genotype in option C has I
A
and I
B
allele but I
O
is absent and these parents can have a child with AB blood group only; this is the incorrect answer. Genotype in option D has all three required alleles; I
A
, I
B
, I
O
, but to have a child with O blood group, both parents should have at least one I
O
allele; this makes it a wrong option.
O blood group