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Genes in common question

  • 12-02-2008 1:22am
    #1
    Bottle_of_Smoke
    Registered Users, Registered Users 2 Posts: 9,770 ✭✭✭


    The following was posted in PI

    Hi,

    Kind of a weird one maybe. I have started seeing this guy recently and we are getting on very well. We are from the same town and have known each other years so it is nice to have that as a basis, things have been going really well since day 1. Anyway.

    We found out by pure fluke a few weeks ago that we may be related. In fact we definitely are. Not in the weird way I hope! But from what I have learned - his grandmother and my great grandmother were sisters. What I'm wondering is what does that make us? 4th cousins!? 1st cousins a few times removed?!

    And more importantly, is it weird/wrong for us to continue this relationship if we are related in this way? We've put things sort of on hold since the revelation. I like him a lot and want to get this back on track...once it's not morally wrong!? Would be really keen to get people's opinions/advice on this.

    Thanks.

    Can anyone estimate what persentage of genes the OP & her boyfriend share. I gave my own estimate on the thread but I'm not sure I'm calculating it correctly

    Cheers


Comments

  • #2
    2Scoops
    Registered Users, Registered Users 2 Posts: 1,845 ✭✭✭2Scoops


    It's impossible to calculate.


  • #3
    GuanYin
    Closed Accounts Posts: 15,552 ✭✭✭✭GuanYin


    Genes in common? I'm not sure I understand or sure you understand what you're asking.

    They most likely have the same genes in common that you and I do, the alleles of genes for genetic diseases is the issue, the risk would be low at their relationship level, no more than it would be for, again, you and I.


  • #4
    tallaght01
    Closed Accounts Posts: 5,778 ✭✭✭tallaght01


    genetic inheritance is such that you could never calculate how many genes they have in common, given the info above.
    But, as psi says, people worry about genetic diseases. At that relationship level, I wouldn't get worried about it.


  • #5
    Bottle_of_Smoke
    Registered Users, Registered Users 2 Posts: 9,770 ✭✭✭Bottle_of_Smoke


    PSI yes that's possible. From what I remember in books, there's something about sharing genes/having commn gentic inheritance with those you're related to, always says 50% with parents/siblings. 25% with unles/grandparents, and so on.


  • #6
    2Scoops
    Registered Users, Registered Users 2 Posts: 1,845 ✭✭✭2Scoops


    Bottle_of_Smoke wrote: »
    PSI yes that's possible. From what I remember in books, there's something about sharing genes/having commn gentic inheritance with those you're related to, always says 50% with parents/siblings. 25% with unles/grandparents, and so on.

    You inherit genes from from your parents, roughly 50% from each, but different siblings could inherit very different parts of their parents' genomes! It's impossible to calculate the amount of common genetic inheritance in the example above. The best you could hope for is to calculate the theoretically maximum possible amount - which will be a huge overestimate.


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  • #7
    emmiou
    Registered Users, Registered Users 2 Posts: 145 ✭✭emmiou


    You could calculate the coefficient of inbreeding, http://www.genetic-genealogy.co.uk/Toc115570144.html


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