My parents have O+ and AB+ as blood types. How the heck do I have B-?

Question

I received my Donor Identification card from the Central Blood Bank the other day, in which I learned my blood type for the first time (it's stated on the card; it's B-). My parents have O+ and AB+ as blood types. How the heck do I have B-? And how come, if that was so, why didn't that blastofetalis thing occur from having different Rh factors being transferred through the placenta? Or is it just a mistake do you think? I took AP Biology, but I never really encountered this situation. Thoughts?

Answer 1

You are Type B because your AB parent gave you a B and your OO parent gave you an O. OB is Type B.

You can be Rh negative because each positive parent can give you one gene for negative if they are heterozygous.

An Rh negative mom will make antibodies if she carries an Rh positive fetus, and her subsequent Rh positive babies could be in danger. But the mom can be given a Rhogam injection that prevents the problems.

An Rh negative fetus should not cause any antibodies to be produced in a positive mom.

Answer 2

Think.

One of your parents had blood genes O and O, The other had blood genes A and B

You had to come out either O and A or O and B because you got one from each parent.

RH is similar but more complicated. The Rh thing depends on a series of genes. Apparently neither of your parents is 'pure' Rh+. They each carry some positive and some negative Rh genes. If they had all Rh- except for one, then they would be Rh+. So, by chance you didnt get RH+ from either of them. That's a little unusual but not a big deal.

The problem with reaction from Rh+ works the other way around. If your parent was Rh- and the baby was Rh+ (because the dad was RH+ and gave RH+ genes) then the mom would have a reaction against the baby. Usually on a first Rh+ baby it wouldnt be fatal, but the next Rh+ baby the reaction would happen faster.

Answer 3

Lets say mom is O+ and Dad is AB+

A and B are codominant and O is recessive so we know that moms gametes (eggs) must code for O type. Dad, on the other hand produces sperm that are 50% A and 50% B.

The Rhesus factor (pos or neg) is coded by a different gene where pos is dominant to negative.

So your parents must both be heterozygous for the Rh factor (i.e. 1/2 there gametes produce Rh+ and 1/2 Rh-)

So when you were conceived you received an O allele and a - allele from one parent and a B allele and a negative allele from the other parent. As a result you are B negative.

Your folks are your folks

Answer 4

This is a good example of Mendel's Law of Independent Assortment.
A simple punnett square shows that any of your parent's offspring must be either type A or B.
Since the Rh factor is inherited independently, both of your parents must be heterozygous for this trait. Your odds of being Rh- was 1:4.
It's all cool.

Answer 5

FETUS IS the yank AND common clinical term FOR FOETUS. interior the fetus, there is an commencing between the appropriate and left atrium (the foramen ovale), and a large style of the blood flows from the appropriate into the left atrium, then into the left ventricle from the place it is pumped interior the direction of the aorta into the physique. a number of the blood strikes from the aorta interior the direction of the internal iliac arteries to the placental arteries, and re-enters the placenta, the place carbon dioxide and different waste products from the fetus are taken up and enter the mummy's stream. SEE URL desire THIS helps additionally do no longer forget like a number of my pupils do>>the placenta is the only tissue in humens it particularly is made out of the two the advent up fetus and the mummy.

Answer 6

You are B blood because your father will always give off the i allele while your mom can give off the A allele or the B allele. You got Bi, this is heterozygous B blood.

i think you are rh- because your parents were heterozygous and gave off both rh- to you.