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Are you the only rh negative in your family?

Are you the only rh negative in your family?

 Rhesusnegative.net9
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One of the questions I am receiving is “Why am I the only rh negative person in my family?”
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The answer: You are not!

You just don´t know the people in your ancestry line who are or were.
One thing about rh negative blood is that it is being passed on recessively.
It means that for 100s of years it could have been that your ancestors were all rh positive, yet carried the rh negative gene recessively.

Let´s use r as the rh negative gene and R as the rh positive gene.

If you are:

RR – You are rh positive and don´t carry the rh negative gene.

It means that all your children will have to turn out rh positive.
They can however carry the rh negative gene recessively being Rr if they receive the r from the other parent. So you can wind up having rh negative grandchildren.

Rr – You are rh positive, but carry the rh negative gene recessively.

If you have an rh negative partner, they kids can turn out either negative or positive, but will for sure carry the rh negative gene recessively. If your partner is Rr like you, they can also turn out rh negative if both rs connect.

rr – You are rh negative and only rh negative.

Your children will for sure carry the rh negative gene, but it depends on the partner and chance whether or not their phenotype will be rh negative or rh positive.

For you to be rr, both parents need to carry at least one r each.
All of your family, from what you know, can be Rr with you being the one turning the recessive gene into showing up as being rh negative with both parents passing on the recessive gene to you.

Of course, someone down the line must have been rh negative on both sides of the family. But theoretically it could be that the recessive gene could have been carried for many generations without ever showing up.

And for whatever reason, you are the one who rh negative as are at least two of your ancestors.

Correction edit:

Technically speaking, it could be one ancestor responsible for you being rh negative if both of your parents are (distantly) related to each others.

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9 Comments

  1. Cathy Miller February 19, 2015

    Ok, I am the only RH-in the family and you say at least 2 of my ancestors were rh. So, what does that mean…who were they? I also have a Da Or DU factor. I can tell you that I am exactly opposite of what you people say. Both my mom and dads family are blue eyed rh +. My husband a YAQUI indian’s family are all RH+. I am -. My sons are both RH+ with golden beautiful eyes. The first brown eyes on my mom and dads side. Yes, my grandfather on Mother’s side a Mc Cray had alburn hair. I have red-undertones…but, last and not least….I have always known I am different than others. So, what’s that suppossed to mean? My mom and dad were married 55 years and had 6 children. I am #4. Me and my mom both died when she was pregdant with me…The dr’s gave her erythomycin and DES…pushed me back to her womb. I was later born and we both died again…the dr’s gave us tranfusions(which was not legal till 1964 but saved our lives. I was born in 1957 July 28th on a SUNDAY. I have 7 leos in my chart. I should be one of the richest people in the world. But…I’m not. I am very content living life on my terms of humility…so , how can my special blood help you? And, be honest….because I detest liars…and I will know if you tell false

    • Mike DammannAuthor July 23, 2018

      Technically speaking, it could be one ancestor responsible for you being rh negative if both of your parents are (distantly) related to each others.

  2. Gichana Irene September 27, 2015

    hi am the only one who is negative rhesus in my family what would have happened

    • Linda Pugh December 20, 2015

      both parents were positive, my elder sister is positive, but i am rhesus negative, have we got the same parents

  3. Desalegn Demelash December 6, 2015

    is blood type O with RH positive has protection from HIV/AIDs than others blood types ?

  4. JC Wallander January 10, 2021

    Have seen websites with inconclusive suggestions and speculations. How one can determined it more reliably. Example: siblings, one with RH AB+ and another RH- 0…?
    Can one locate a straightforward answer?

    • Ken January 10, 2021

      for a blood type O Rh(D) negative person to come from your example: both parents must also carry the O Rh(D)- gene and because another child from this pair is AB Rh(D)+ :: one parent must be type A and one must be type B. one parent may be Rh(D) negative and the other one Rh(D) positive or both parents may be Rh(D) positive. if one can get/provide more known direct relatives blood types & Rh(D) types for this example, then typing for the parents could be or can become more precise or possibly exact.

  5. emily August 28, 2022

    I am A- and Rh- neither of my parents are siblings are. But both are my daughters are also A- Rh-.. how does that happen?

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