The genotype (allele combination) of a person with blood type B could be BB or BO.
Based on the law of independent assortment, the allele combinations BB and BO will be separated eqally
during meiosis. In other words, for a male with blood type B and alleles BO, 50% of his sperms are
genotype B, and 50% are genotype O, while 100% are B if he has alleles BB.
For female, the eggs have the same pattern. Children of two blood type B parents may have 93.75% frequency
to be blood type B (BB or BO genotype), and 6.35% frequency to be blood type O (OO genotype). For detailed
calculation, see Blood Type Calculator page.
• Blood type B + B:
| Parent Blood Type (B) | |||||
| B (75%) | O (25%) | ||||
| Parent Blood Type (B) | |||||
| B (75%) | B/B (56.25%) | B/O (18.75%) | |||
| O (25%) | O/B (18.75%) | O/O (6.25%) | |||
Children Type O (OO) = 6.25%
• Blood type B + A:
| Parent Blood Type (A) | |||||
| A (75%) | O (25%) | ||||
| Parent Blood Type (B) | |||||
| B (75%) | B/A (56.25%) | B/O (18.75%) | |||
| O (25%) | O/A (18.75%) | O/O (6.25%) | |||
Children Type A (AO) = 18.75%
Children Type B (BO) = 18.75%
Children Type O (OO) = 6.25%
• Blood type B + AB:
| Parent Blood Type (AB) | |||||
| A (50%) | B (50%) | ||||
| Parent Blood Type (B) | |||||
| B (75%) | B/A (37.5%) | B/B (37.5%) | |||
| O (25%) | O/A (12.5%) | O/B (12.5%) | |||
Children Type A (AO) = 12.5%
Children Type AB = 37.5%
• Blood type B + O:
| Parent Blood Type (O) | |||||
| O (100%) | |||||
| Parent Blood Type (B) | |||||
| B (75%) | B/O (75%) | ||||
| O (25%) | O/O (25%) | ||||
Children Type O (OO) = 25%
ABO blood group system can be used together with Rh blood group system, the later can be + or -. Blood type B can be B+ or B-.
Blood type B+ can accept blood from B+, B-, O+ and O- Donor's red blood cell.
Blood type B+ can accept blood from B- and O- Donor's red blood cell.
Blood type B+ donor's red blood cell can only be accepted by B+ and AB+ recipients.
Blood type B- donor's red blood cell can be accepted by B+, B-, AB+ and AB- recipients.
Blood type B can accept blood from B and AB Donor's plasma.
Blood type B donor's plasma can be accepted by blood type B and O recipients.
Blood type B has higher frequency in Asia, East Europe, where about 20-30% population is type B. Blood type B is low in America, Australia and West Europe, where <10% of the population is type B.
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