AB+ and O- can these exist in siblings with the sa - Page 10

Originally posted by: psychopinks

Really? oh oops never mind then. I just thought O- was always a rare blood group whereas O+ wasn't. In fact in my 6th year of school, our whole year got took to donate blood and 3/4 of us ended up being O+. Well learn a new fact every day 😊

Originally posted by: princessunara

oh actually O- is the rarest blood type in a world scale i think, but there r regional pools that r different..that is what i meant..
i think AB+ is as rare as O-, but it is never talked about as it being rare is not a problem as they can take blood from anyone..:-)

Originally posted by: psychopinks

Aaah okay got it! 😃 Oh yeh I knew about the AB+ I went around for a while thinking I had AB+ blood, quite happy that even though I would be limited as to how many people I could give blood to I could take it from anyone positive 😛. But then turned out I was B+ :( haha!

Originally posted by: butterfly06

yes it can...I'm ab+ and my brother is O-

It can exist!

There are 2 factors pheno type and geno type

Pheno type is the letter : A,B,O

Geno type is: + , - (Rhesus factor)

For every person there will be two geno types and two pheno types constituting the blood. But only one will be dominant in each type and again each person will get one pheno type and one geno type from each parent

now if Arnav's mom should be A+ve , ie, she carrried (AO) (+-)

(because A will be dominant over O and +ve will be dominant over -ve)

and Arnav's father should be B+ve, ie He carried(BO) (+ -)

(because B will be dominant over O and +ve will be dominant over -ve)

(or vise versa, ie Dad A+ve, Mom B+ve)

And Arnav would have received O from both the parents as Pheno type and -ve Rhesus factor (geno type) from both the parents , so he is O -ve

So it is completely possible...

Curiously Anjali received all that is dominant from her Parents blood and Arnav received all that is recessive!