rhesus

[Maloney]

Can two parents that are positive have a negative child ?

[trodgers5]

I am not a doctor but I dont think parents who are both rhesus positive can have a negative baby.  It is not the same as blood groups because to be rhesus negative it means that you are missing a protein that coats red blood cells or something like that.  I think it is inherited from parents and I know it is dnagerous for pregnant women if they are negative and child is positve.  I am not sure if it is medically possible for a child to have this protein missing if both their parents have it - it doesnt sound likely.  Hope this helps a bit

[netibiza]

No, I am rhesus negative and one of my parents was also - I am 99percent sure that this has to be the case

[silly moo]

I think yes.
If , as I think , the rhesus negative gene is recessive then to be rhesus neg you need two neg genes.
If you have 1 rh pos and 1 rh neg you will be rh pos. However you can pass on the rh neg gene.
If both parents carry 1 rh neg gene then statistically 1 in four of their offspring will be rh neg.
HOWEVER if my original sentance is wrong then the rest of the explanation is also c**p.

http://library.thinkquest.org/C0115080/?c=groups&v=p rintable

Just found this link - check it out.

[netibiza]

Having read  that site silly moo it appears that two positives cannot have a negative child as D+ factor is stronger than d- so two D+ cannot produce a d-.  My husband is + and I am - and our daughter is +(my mother was - and all 7 of us siblings were - so we think Father must have been - also)

[Gem123]

have a look at www.blood.co.uk

[ursula62]

The answer is yes.

The site does not disprove sillymoo's answer. All it says is that the  rhesus Negative gene is recessive (i.e. non dominant) and  the Rhesus positive gene is dominant.

Thus even though a parent may be Rhesus Positive, they may also carry the recessive negative gene.

If two Rh Positive parents both carry recessive negative genes, then as sillymoo states, one out of 4 children has the chance of being RH negative, the other three will be Positive, but two of them will carry the recessive negative gene.

However, if both parents have only RH positive genes - with two Rhesus Positive genes then there is no way the baby can be RH negative as the Rh Positive gene always takes precedence.

The basic rule of thumb in genetics is that some genes are dominant, and some are recessive. The recessive genes give way to the dominant ones, but can be passed on to offspring. If an offspring ends up with two recessive genes (rather than one dominant and one recessive) then they take on that characteristic controlled by the recessive gene. Otherwise the dominant one wins.

[silly moo]

ursula isn't that basically what I said - even if put better?

[ursula62]

Yes silly moo, but I was answering Net's comment that the article didn't prove your point

[silly moo]

Sorry and thank you.
I

[netibiza]

Don't blame me but I stand by what I know of my own blood

[ursula62]

Hi Net, Your father could have been positive but had one positive and one negative gene. This would have given him a positive rhesus value himself, but enabled him to pass on the rhesus negative factor to his children.

If you are Rh negative, the fact that your daughter is positive should explain it to you. She got one negative gene from you and the positive one from her father. So, perhaps like your own father she is positive herself but carries the negative gene.

[netibiza]

ursula I see your reasoning but the thing is out of 7 children we had 3 different fathers - but we are all rh neg 0, my mother being the same.  So these different men could have been any blood group - is that right?

[mrs.pudding]

I know you've had lots of answers but ........ both my parents were positive and yet one of my brother's and I are both negative.

Two negative parents can't produce a positive!

[ursula62]

Yes Net. The men could have been any blood group. You get one gene from your mum and one from your dad and if the genes are not the same then the positive one takes precedence.

For all of the children to end up as negative, each of the fathers must have carried a negative gene, whether or not their own blood group was Rh positive.

[slovetthorn]

Both my parents are rh pos. and I am rh neg. so yes two rh pos. parents can have a rh neg. baby.