Rhesus Negative Factor

[mgeneas]

My husband and I are both O negative. My Mum and one of her siblings are O positive, I don't know about the others. My sister is AB positive. We wonder what group our father might have been!

I wonder about the Rhesus factor when looking at some of my ancestral families where there are many infant deaths.

[3sillydogs]

Your dad may have been the RH neg,

I have as well, one ancestor lost almost half of her children just after birth....

Also may have been a factor in miscarriages happening after the birth of the first child.

[Billyblue]

My husband and I are both O negative. My Mum and one of her siblings are O positive, I don't know about the others. My sister is AB positive. We wonder what group our father might have been!

I wonder about the Rhesus factor when looking at some of my ancestral families where there are many infant deaths.

Usually, where you find a woman has one child, then all other pregnancies end in miscarriages or stillbirths, it is because of the Rh neg factor.  They just didn't know what it was, centuries ago, and blamed it on the wrath of God or some such thing.

Dawn M

[myluck!]

My husband and I are both O negative. My Mum and one of her siblings are O positive, I don't know about the others. My sister is AB positive. We wonder what group our father might have been!

I wonder about the Rhesus factor when looking at some of my ancestral families where there are many infant deaths.

For you to be O- you must have received an O from each parent and a Neg- from each parent

For your sister to be AB+ she has to have an AB (dominant) and a Pos+ (also dominant)

To have the same parents and knowing your Mum is O+ two parts (O and O)
So your Dad must have given your sister the AB;
for you to have been O he must have been AB/O
which means he would have tested as AB blood type

As your sister is Rhesus positive she receive a positive from both at least one parent
however, as you are negative you received a Rhesus negative from both parents
which means they both had one part each [+ and -] so each would test as Rhesus positive

This would make your Dad's type AB+ [AB and O with Rhesus + and -]

[mgeneas]

Thank you myluck, that is a very clear explanation - I actually understand!

[avm228]

As your sister is Rhesus positive she receive a positive from both parents

Shouldn't this be "from at least one parent"?

[myluck!]

As your sister is Rhesus positive she receive a positive from both parents

Shouldn't this be "from at least one parent"?

Thank you avm228 you are correct and I've corrected above - apologies to mgeneas
However it doesn't change the outcome of the calculation as AB+

[Deirdre784]

I'm a Rh negative too, as was my dad (he gave loads of blood, I was stopped having fainted on the first 2 occasions, despite being perfectly happy to donate!). My husband is a positive so they kept a close eye on me when I was expecting my children, who are both positive.

Dad's grandparents lost 6 babies, at a few days to a few months, from a variety of causes.

[hurworth]

My husband and I are both O negative. My Mum and one of her siblings are O positive, I don't know about the others. My sister is AB positive. We wonder what group our father might have been!

I wonder about the Rhesus factor when looking at some of my ancestral families where there are many infant deaths.

A person with AB blood group inherits an A from one parent and a B from the other parent.

Unless a mutation occurs an O parent wouldn't have an AB child.