Are sibling blood types always the same?

Question

If my sister has A+ blood, is mine the same if both our parents are the same?

Answer 1

Well, for certain we all are exactly the product of our parents. The proof of this is in our Blood. Let's take a look at some of the "rules" of Blood type genetics for the population of the United States. (Other population groups have differing Blood type statistics. See information HERE.) There are basically four primary common Blood types. The most common by far is Blood type O, followed by type A, type B, and the least common is Blood type AB. Blood type is determined by the "alleles" that we inherit from our parents. Alleles are different possible types of a particular gene, in this case the gene(s) controlling our Blood type. There are three common Blood type alleles: A, B, and O. We all have two alleles, one inherited from each parent. The possible combinations of the three alleles are: OO; AO; BO; AB; AA; BB.

Blood types A and B are called "codominant" alleles, (they share in the controlling influence of our genetic Blood make-up) while O is "recessive." A codominant allele is apparent, or dominant, even if only one is present; a recessive allele is apparent only if two recessive alleles are present. Since Blood type O is recessive, it is not apparent if the person inherits an A or B allele along with it.

Therefore, there are certain possible allele combinations in a particular Blood type:

OO = Blood type O
AO = Blood type A
BO = Blood type B
AB = Blood type AB
AA = Blood type A
BB = Blood type B

What all of this means to the paternity puzzle is that ABO Blood typing can only give some preliminary indications as to possible paternity. This rule, however, can not be universally applied, because the vast majority of most people in Caucasian populations has only two of those types (A and O). This means that a male may have a type consistent with paternity and still not be the father of the tested child. DNA typing always yields a more reliable conclusion regarding paternity and is the final word in paternity legal cases.
Of Special Interest on BloodBook.com!
Of Special Interest on BloodBook.com! Of Special Interest on BloodBook.com!
There are some good reasons for a husband to not donate Blood to his wife during her childbearing years. During this time, a women who plans to become pregnant, receiving Blood from her husband may pose a small risk to the infants born of these pregnancies. If, after the Blood transfusion the woman develops an antibody to an antigen on the father's red Blood cells, and the subsequently born fetus inherits the father's red cell antigen, the antibody from the mother may enter the Bloodstream of the fetus causing destruction of fetal red Blood cells. This may cause serious anemia in the fetus and excessive jaundice in the infant after birth. This is a known major cause of brain damage. Special Blood transfusions, using selected red Blood cells that do not have the particular in-compatible and offending antigen, are available when this condition is pre-diagnosed. Of course, we suggest autologous Blood donation for the mother. However, for those mothers who are unable to make an autologous donation, the decision to select her husband as a donor should always take this risk under consideration, and specific consultation with your pediatrician on this subject is essential.
clear.gif (807 bytes)

There are instances when the following chart will not be accurate. In the case of a mutation, the Blood typings may not hold true in the question of parentage.

The chart should be used as general information only. All health care decisions should only be made with consultation from your physician. Ask before you act.


PARENTS' BLOOD TYPES POSSIBLE CHILD NOT POSSIBLE CHILD
A and A A, O B, AB
A and B A, B, AB, O no
A and AB A, B, AB O
A and O A, O B, AB
B and B B, O A, AB
B and AB A, B, AB O
B and O B, O A, AB
AB and AB A, B, AB O
AB and O A, B AB, O
O and O O A, B, AB


Rh status works in a way similar to Blood type groups. If you are Rh positive, you may have genes for both positive and negative. If you are Rh negative, you have two genes for Rh negative. In the following chart, the child's Rh factor is in the white area.

Father's Group


Mother's Group

Rh +


Rh -

Rh +


Rh +, Rh -


Rh +, Rh -

Rh -


Rh +, Rh -


Rh -

Answer 2

This Site Might Help You.

RE:
Are sibling blood types always the same?
If my sister has A+ blood, is mine the same if both our parents are the same?

Answer 3

Blood Type Paternity Chart

Answer 4

Nope I have 11 brothers & sisters only 2 of us have my dads blood type the others have all different types no one has my mothers blood type.

Answer 5

My other siblings ( 3) and I, all have the same blood type. We all have the same father and mother.

Answer 6

no not at all ive always found the best way to know your blood type is to go and donate some blood your answer your question and you will be helping

Answer 7

No... if for example, one of your parents is AB and one is AO, your sister could still be A (AA or AO), but you could be anything except O. Usually, if you give blood (like at a drive), they will send you a card showing you your exact blood-type.

Answer 8

Not necessary but your blood types has to be the same with either your mom or yr dad unless u are adopted.

Answer 9

No, it depends on what alleles your parents have for their blood types. The could have the genes for AA or Ao, so you could be A or O.

Answer 10

No. My mom and one of my brothers are AB positive, my dad and another brother are type 0. My other brother is A positive and I am AB negative.