1) The ABO blood group system has multiple alleles that determine the blood type.
2) The alleles IA and IB determine the A and B antigens, while i determines the O type.
3) Crossing different ABO genotypes can determine the offspring's probable blood type.
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Multiple allele
1. 2
17
21
Multiple Allele
Multiple Allele
2
ABO 3
IA IB i
ABO
ABO
Multiple
Alleles
2. 2
(
2n
) 2
Homologous
ABO
3
IA (I
soagglutinogen) A
IB (I
soagglutinogen) B
I Recessive IA IB
3. O
AB
O x
AB
genotype ii x IA IB
i IA IB
genotype IA i IB i
A B
6.2
AB
A O
AB x
O
4. genotype IA IB ii
IA IB i
genotype IA i IBi
A B
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