In my original post I was making a suggestion based on natural selection not knowing that the neg gene is always recessive (yes I also did some research). Because the negative gene IS RECESSIVE  two negative parents have only negative genes to pass on and therefore cannot have a positive baby. If the parents had a pos gene to pass on they would themselves be positive. The positive parents can however pass on either of their two positive genes and I think this is what Leanne means when she says that a positive person can have a positive recessive gene because they can be Dd or DD.
Cheers Fiona (always willing to be corrected)
 
Both parents must have had one gene for each Rh typing and passed on
>> their recessive gene so that bub got two copies of positive and
>> therefore was positive????

  Two
Rh neg parents always have Rh neg offspring but two Rh pos parents can
have an Rh neg child.  Gloria

Leanne wynne wrote:

> Rh neg is recessive so in order for someone to be Rh neg blood group
> they must possess 2 x Rh neg genes - one from each parent. If someone
> is Rh pos it is possible for them to carry either a positive or
> negative recessive gene. I hope that makes sense?
> Leanne
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