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Rhesus factor and heart

  1. Jan 29, 2015 #1
    can two +ve rhesus parents have a negative rh factor offspring?
    Can a person have heart on right and two hearts?
    I know it is rare.
     
  2. jcsd
  3. Jan 29, 2015 #2
    Positive rhesus can be ++ or +-. Two ++ parents cannot have an offspring with a negative blood group. Both parents need to have a -, as far as I know.

    I don't know about 2 hearts, but there is a rare condition called 'dextrocardia' in which the heart is on the right side.
     
  4. Jan 29, 2015 #3
    But one family was saying that the Rhesus factor of the parents were both positive but their offspring was having negative rh factor. Might be they are not telling truth or the blood test might have given some wrong report?
    See this link of Google showing a girl having 2 hearts and a man.
    https://www.google.co.in/#q=a+person+with+2+hearts
     
  5. Jan 30, 2015 #4

    Suraj M

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    Thanks Raghav. I was actually going post the same question.
    My dad himself is Rh -ve and both my grandparents are Rh+ve. I don't know how this is possible.
    o
    Siddharth, sadly, your wrong about that, because both the parents need not have Rh-ve for their baby to be a Rh-ve. I'm Rh-ve and my moms Rh+ve. .This I can assure you.
     
  6. Jan 30, 2015 #5
    Like I said, the + sign in your blood group isn't the only thing. It can be either ++, +- or --. Your mom must be +-. I'll check it up and let you know.
     
  7. Jan 30, 2015 #6

    Suraj M

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    Oh wait!
    I just found out.
    A baby gets Rh+ve even if one of the aquired genes of the parents is of Rh+ve. so the Rh recessive is trumped by the dominant gene.
    There is a possiblity for two Rh+ve parents to have a Rh-ve baby.
    This is because, both parents might have a recessive Rh gene, but still expressed as Rh+ve due to the other gene.
    so in a rare situation the recessive gene of both the parent's may be passed on to the baby, making him/her Rh-ve
     
  8. Jan 30, 2015 #7
    Yeah right. The dominant and recessive traits play a part. There are a few laws to it, discovered by Gregor Mendel. If the recessive traits from bothe Rh +ve parents come into the offspring, he will be Rh -ve.

    Check this:
    http://en.wikipedia.org/wiki/Dominance_(genetics)
     
  9. Jan 30, 2015 #8

    Suraj M

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    So theres about ½ ×¼? chance that such a Rh-ve Baby results from 2 Rh+ve.
    is -----------------⤴⤴⤴ right?
     
    Last edited: Jan 30, 2015
  10. Jan 30, 2015 #9
    It differes in every case. If the two parents are +- and +-, then the child can be-

    1) ++ (complete dominance) 2) and 3) +- or -+ ( incomplete dominance) 4) --

    Only in case number 4 will the offspring be Rh -ve. So 1/4th chance
     
  11. Jan 30, 2015 #10
    Thanks to both of you for explaining more on rh factor, and my heart question is also answered. By the way I was asking that whether a person could have heart on right, just for a worldwide perspective as my grandfather has a heart on right side.
    Sharing with you an incident :
    The doctors would be confused when they would keep the stethoscope on left of my grandfather and wonder where the heart has gone, because they could not hear any heartbeats.:D
     
  12. Jan 30, 2015 #11

    Suraj M

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    Oh nice and creepyo0).
    Is that by any chance the same as pericardial reflection, its really rare.
     
  13. Jan 30, 2015 #12

    Suraj M

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    No, siddharth, I was trying to multiply the probabilty of both the parents being of +- . How do you do that??
     
  14. Jan 30, 2015 #13
    Don't know about pericardial reflection, but
     
  15. Jan 30, 2015 #14

    Suraj M

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    Oh okay I'll check it out.
     
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