6. In human ABO blood typing, there are three alleles possible (I A , I B , i) t
ID: 90349 • Letter: 6
Question
6. In human ABO blood typing, there are three alleles possible (IA, IB, i) that result in four blood types (A, B, AB, and O).
a) If one parent phenotype is type A blood and the other type B blood, and they have four children who represent all of the blood types, what are the genotypes of the parents?
b) Could a child of type O blood have a type A father and a type AB mother?
c) If the first child is type A blood, and his parents are type AB and type O, what is the chance that the second child would have type A blood?
Explanation / Answer
6. In human ABO blood typing, there are three alleles possible (IA, IB, i) that result in four blood types (A, B, AB, and O).
three different alleles, IA, IB, and i.
IA and IB alleles are codominant,
the i allele is recessive
Type A --------genotype -------IAIA or IA IO
Type B --------genotype-- IBIB, or IB IO
Type O --------genotype -----IO IO
a) If one parent phenotype is type A blood and the other type B blood, and they have four children who represent all of the blood types, what are the genotypes of the parents?
Type A --------genotype -------IAIA or IA IO
Type B --------genotype-- IBIB, or IB IO
Type O --------genotype -----IO IO
one parent phenotype is type A blood and the other type B blood
Type A --------genotype ------- IA IO
and the other type B blood
Type B --------genotype IB IO
IA IO X IB IO
IA
IO
IB
IA IB Type AB
IO IB Type B
IO
IA IO Type A
IO IO Type O
PARENTS GROUPS ARE
Type A --------genotype ------- IA IO
Type B --------genotype IB IO
b) Could a child of type O blood have a type A father and a type AB mother?
No
Type O --------genotype -----IO IO
genotype -----IO IO is not possible
c) If the first child is type A blood, and his parents are type AB and type O, what is the chance that the second child would have type A blood?
Type A --------genotype -------IAIA or IA IO
Type AB --------genotype -------IA IB
Type O --------genotype -----IO IO
genotype -------IA IB X genotype -----IO IO
IA
IB
IO
IA IO
IB IO
IO
IA IO
IB IO
what is the chance that the second child would have type A blood?
EVERY ISSUE IS NEW AND INDEPENDENT EVENT
ONE ISSUE DOESNOT AFFECT NEXT ISSUE
HENCE
chance that the second child would have type A blood = 50%= 0.5 ANSWER
IA
IO
IB
IA IB Type AB
IO IB Type B
IO
IA IO Type A
IO IO Type O
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