One gene that influences blood
One gene that influences blood type in humans is the ABO bloodgroup system. There are 3 alleles: IA, IB,and i, that are co-dominant or dominant to one another. For eachcross below, indicate the phenotypes and ratios ofthe expected offspring:
a) IB i male crossed to i i female
b) IA IB male crossed to i i female
c) IA IA male crossed to IA ifemale
d) IB i male crossed to IB i female
e) IB i male crossed to IA i female
Answer:
IA and IB alleles are codominant to each other and results in ABtype blood group. IA and IB are dominant to i and results in A andB type of blood group and ii allele results in O type bloodgroup.
The respective crosses are shown below with their phenotypes andgenotypes ratios:-
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