does a child have to have the same blood group as either of the parents?

Question

For example, a boy has blood group AB+ while his mother is B+ and father is A+. Can he receive blood from any of the other three groups,or only from his own group?

Answer 1

I used to know this, so I'm a little rusty. Every person has two sets of alleles for every gene. Sometimes one of those alleles is dominant and the other is recessive. The parent who has a B type blood has two possible sets of alleles: a B type allele on one and an O type on the other OR a B type on each allele. There are no other combinations. The O type is recessive and is not expressed. If someone has an O type blood, he has an O type trait on each allele. A person with A type also has two possible combinations of Alleles. Either an A type allele on one and an O on the other or A type alleles on both.

You might be able to tell which parent had what on both alleles by looking at two or more generations, but, as in the case that you describe, you'd have to look at more than two generations. That is because the person with AB type blood has only one possible combination: an A type on one and a B type on the other. Obviously, he inherited the B type from the mother and an A type from his father. Both the A and B types are dominant genes and are both expressed. However, if either the mother or the father had also had the recessive O type allele, the boy could just as likely had A type or the B type. You only inherit one allele from each parents (so that you have a total of 2 alleles for each gene), so if the father had B types on each Allele, the boy would only inherit one B type and if the mother had an A on one and an O type on the other, he would either have B type blood or AB type blood as he would would have inherited either the A type or the O type from his mother. You can't tell until you test it.

Persons with AB type can receive type A, B, AB, or O type blood. They are universal receivers.

Now for the Rh factor. Positive or negative type blood is also an inherited trait although the gene for positive or negative blood is inherited independently from the A and B and O genes. There are only two types: positive or negative. Positive is a dominant trait and negative is a recessive one. As such, if a person has a negative Rh, that person has a negative type on each allele. If the person has a positive Rh, the person could either have two positive type alleles OR one positive and one negative. Since you inherit one from each parent and both parents are positive and the boy is positive, that means that both parents either have one positive and one negative or both positive alleles. Also, the boy may have one positive and one negative or both positives. You can't really tell without looking at several generations.

The bottom line is that the boy can have the type you describe from the types of the parents you describe and he is a universal receiver of any type of ABO blood (but the parents need either O blood or their own type of blood).

Answer 2

There are four blood types, O, A, B, and AB. When people have a child, they inherit the blood types of both parents. Here's a chart of how it works:

Parents' Types --> Child's Type

O + O --> O
A + O --> A
B + O --> B
A + A --> A
B + B --> B
A + B --> AB

Ideally, when getting a transfustion, you should get the same blood type that you have. So if you're B, you should get B. However, you can't get a transfusion from just anyone. If you have blood type O, you should only be getting transfused with O blood. If you have A, you can get O or A safely. If B, you can get O or B safely. If you're AB, you're lucky, because you can get O, A, B, or AB.

The only other restriction is the Rhesus Factor, which determines + or -. If you're -, you shouldn't be getting blood that's +, but if you're + you can safely have + or - blood transfused into you.

Answer 3

Type A and B blood are co-dominant, while type O blood is recessive. Since everyone has 2 sets of DNA - diploid, your a person can inherit an A gene from dad and a B gene from mom to become AB. It is possible for this child to be type O if mom and dad are heterozygous, meaning mom has 1 A gene dominating over an O recessive gene and dad has 1 B gene dominating over an O recessive gene. If this is the case then the child has a 25% chance of being type OO, a 25% chance of being type AO, a 25% chance of being type BO, a 25% chance of being type AB. As far as blood donation goes, AB+ is a universal receiver and O- is universal donor.

Answer 4

His chances of being AB were higher than for any other type. And yes he can recieve from any of those groups as well as O. AB is the universal receiver of blood.

Answer 5

The Boy actually could come out any blood type if the Parents are A and B
There are things called Genotypes meaning there are two possible "types" a parent can pass down. A and B are Dominant.

Obviously the parents could pass an A and B to get AB
Dad could have A and Mom could have B(O) and he could end up as type A
Dad could be A(O) and Mom could be B and the kid could be Type B
Or both could be A(O) and B(O) and the kid could get both O's and be type O.

Answer 6

If a person is AB+ they can receive blood from anyone

AB
A (which is actually AO)
B (which is actually BO)
and O (which is actually (OO)

Because they are + they can receive + or - blood.

AB+ is the only group that can receive all the different types of blood.

Answer 7

no longer inevitably. If the two dad and mom are A+ then this is probably that the youngster would be the two an A or O blood sort (the two + or -). Having 2 A+ dad and mom does no longer mean you would be an A+.

Answer 8

Yes. The blood group is ALWAYS what one of the parent's is. It's genetic.

Answer 9

Yes

Answer 10

Anyone with type AB+ blood can recieve blood from any other blood type out there.