To determine the suitable donor's blood type for a patient with the blood type B-, we need to understand the rules of blood compatibility and inheritance.
1. Blood Type Compatibility Basics: Patients can only receive blood from donors whose blood type is compatible with their own. The compatibility is largely determined by the presence or absence of specific antigens on the surface of red blood cells and the presence of antibodies in the blood plasma.
2. Antigens and Antibodies:
- Type B blood has B antigens on red blood cells and anti-A antibodies in the plasma.
- The Rh factor (positive or negative) denotes the presence (positive) or absence (negative) of another antigen (D antigen).
3. B- Blood Type Compatibility:
- Antigens Present: B antigen (no Rh (D) antigen because it is negative).
- Antibodies Present: Anti-A antibodies and Anti-Rh (D) antibodies.
4. Suitable Donors for B-:
- The donor must not have A antigens, as the patient has anti-A antibodies that would react against it.
- The donor must not have the Rh (D) antigen because the patient can only accept Rh-negative blood to avoid Rh incompatibility.
Given these principles, the suitable blood types for a B- patient are:
- B-: Compatible because it has B antigens and no Rh (D) antigen.
- O-: Compatible because it has no antigens (neither A, B, nor Rh (D)), which means it will not react with any antibodies in the B- recipient's blood.
Therefore, the suitable donor's blood types for a patient with B- are B- and O-.
This is why the answer is:
[tex]\[ \text{['B-', 'O-']} \][/tex]
