Can two siblings have different blood types?
Yes, two siblings from the same parents can have different blood groups from their parents. This is because the four ABO blood groups, A, B, AB and O, arise from a child inheriting any one of each blood group gene forms (or alleles) A, B or O from each biological parent.
Do siblings always have same blood type?
Each biological parent donates one of their two ABO alleles to their child. Identical twins will always have the same blood type because they were created from the same fertilized egg (fraternal twins can have different blood types — again, providing the parents do — because they are created by two fertilized eggs).
Can family members have different blood types?
Yes, a child is able to have a different blood type than both parents. Which parent decides the blood type of the child? The child’s blood type is decided by both parents’ blood type. Parents all pass along one of their 2 alleles to make up their child’s blood type.
Do sisters with the same parents have the same blood type?
Siblings do not necessarily have the same blood groups (ABO and Rh) nor that of their parents, unless both parents are O negative in which case bar some possible mutations all the family will be O negative.
What is the best and worst blood type to have?
In the U.S. and Western Europe, O positive is the most common blood type, as is having a positive Rh factor. AB negative is the rarest….How many blood types are there?
| Blood type | Percentage of Americans with blood type |
|---|---|
| A+ | 35.7\% |
| B+ | 8.5\% |
| O- | 6.6\% |
| A- | 6.3\% |
Can I ask my doctor for my blood type?
If your doctor has drawn or tested your blood before, it is likely they have your blood type on file. You can ask your doctor to conduct a blood test if your doctor doesn’t have your blood type on file, call or visit your doctor’s office and ask for a blood test to determine your blood type.