I have Blood type A+, My siblings are all O+ and one parent is O+, what must my other parent be?

Question

I have read that A is dominant over O. Can someone explain the above to me in simple english please.

Answer 1

Good info in the other answers but short and sweet If you and your sibs are O and 1 parent is O then the other parent must be AO genetically type A blood. There is no way the 2nd parent could be AB

Answer 2

Blood type is defined by 2 factors, the letter (ie- o, A, B) and the +/- factor.

For the letters, A and B are both dominant. This means that if the person has A or B as a gene, they will express that gene (meaning, this will be their blood type). This means that if a person has o blood, then they must have 2 o genes because if there was an A or B, then that would be their blood type. Since you are A blood type, one or both of your parents must have A blood. Because you have siblings that are o, this means that both of your parents must have at least 1 gene that is o (because they inherited the blood type from them). So, the other parent must be A bloodtype. Specifically, the genotype of the other parent is Ao.

As far as the +/-, + is dominant over -. So this means that a person with + blood must have at least 1 + gene. Because we don't know more details, we can't determine what the +/- factor of the other parent is.

Answer 3

Your other parent must be type A (can't determine whether Rh positive or negative).

For your siblings to have type O blood, BOTH parents must have been able to pass on an O allele. That rules out type AB blood, which does not have an O allele. And since you have type A, and you know your one parent could not have passed on the A allele to you, then your other parent MUST have passed it on to you. This means that your other parent's genotype was AO (since O is recessive that person's phenotype is A). Since + is a dominant trait, it is impossible to determine from the information provided whether your other parent was Rh+ or Rh-.

Answer 4

Landsteiner developed this system-the *** blood group system.A is dominant over o.So is B.if your siblings are both 0 then both your parents must be heterozygous,ie,they should have both O and A/B genes in a pair of chromosomes.Since u are A, both your parents are A,positive or negative.

Answer 5

The same dominant/recessive rules apply for RH factor on blood typing. Pos rh is dominant over neg rh, so you'll only be neg rh if you get the gene from both parents. One pos rh gene, and you'll be rh pos. (called hetero/homo zygote pairing. ) One can get a recessive trait from further back in their lineage if one parent has a heterozygote pairing. The recessive gene that does'nt show in a parnent's trait can be passed on, then, if paired with another recessive, shows up in the offspring. :-D I hope I'm making sense. It's tough to explain in words only.

Answer 6

Other parent is A or AB.....

A,B,AB,O groups are inherited by multiple allelles

Rh factor is inherited thru complete dominance; Rh+ is dominant; Rh neg is recessive,

A can be homozygous dominant or heterozygous
B can be homozygous dominant or heterozygous
O is homozygous recessive
AB is dominant for both the two proteins on rbcs