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  1. #61
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    I love the Gingers They are a rare specimen hubby says (he is a ginger too) lol.

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    Can anybody tell me my odds of having a red-haired child:

    - I am brunette
    - My partner is red (but faded to strawberry blonde as adult)
    - our son is turning brunette from dark blonde, no red at all
    - my partner's family has quite a bit of red - his sister and dad are red, and it's on his mum's side as well
    - I don't know of any red in my immediate family (ie. siblings, parents, aunts, uncles and grandparents) - all blonde or brunette, but my grandfather was scottish, so there could be red further back

    (sorry to crash OP, but I think about this a lot and this thread reminded me)

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    Too slow.
    Last edited by IndigoJ; 07-06-2012 at 11:09.

  4. #64
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    Quote Originally Posted by MsMummy View Post
    Can anybody tell me my odds of having a red-haired child:

    - I am brunette
    - My partner is red (but faded to strawberry blonde as adult)
    - our son is turning brunette from dark blonde, no red at all
    - my partner's family has quite a bit of red - his sister and dad are red, and it's on his mum's side as well
    - I don't know of any red in my immediate family (ie. siblings, parents, aunts, uncles and grandparents) - all blonde or brunette, but my grandfather was scottish, so there could be red further back

    (sorry to crash OP, but I think about this a lot and this thread reminded me)
    The big issue is whether you have two brunette genes or a recessive gene. In my opinion, since you mentioned blondes in your immediate family, it is likely you have a recessive blonde gene. That combined with a red gene from your partner could (in my opinion) result in a red haired child.

    Since your partner is strawberry blonde, I would expect he would have a blonde and a red gene, so ...

    If you have both a brown and blonde gene, and your partner has a red and blonde gene, that gives a 50% chance of brown haired offspiring (brown gene from you), a 25% chance of red haired offspring (blonde gene from you and red from partner), and a 25% chance of blonde haired offspring (blonde gene from both).

    If either of your parents are blonde, then you have a blonde gene, so the above is true and thus you have a 25% chance of an offspring being red-haired.

    If both your parents are brunette but you have a blonde sibling, then both your parents each have both a blonde and brunette gene, so you have a 66% chance of having a brunette and blonde gene, thus a 17% chance of an offspring being red-haired.

    If both your parents are brunette, and you have two blonde grandparents (one on each side) then both your parents will have a blonde and brunette gene and thus again you have a 66% chance of having a recessive blonde gene which means a 17% chance of an offspring being red-haired.

    If both your parents are brunette and you have only one blonde grandparent but the other branch has only brunettes going back for many generations ... then it is fairly safe to assume (but not guaranteed) that that parent has two brunette genes, but the parent from the blonde grandparent will have one blonde gene, giving you a 50% chance of having a blonde gene and thus a 12½% chance of an offspring being red.

    -------------------

    In short B = brown, b = blonde, r = red.

    For your children, either
    (no recessive blonde gene)
    BB (brown) + rb (red) = Bb (brown) | Br (brown)
    or
    (recessive blonde gene)
    Bb (brown) + rb (red) = Bb (brown) | Br (brown) | bb (blonde) | rb (red)

    So either 0% chance red or 25% chance red

    For yourself
    (brown parents, blonde sibling or two blonde grandparents, 66% chance recessive)
    Bb (brown) + Bb (brown) = BB (brown) | Bb (brown) | Bb (brown) | bb (blonde)
    or (brown parents, one blonde grandparent, other side brown to way back, 50% chance recessive)
    Bb (brown) + BB (brown) = BB (brown) | Bb (brown)

    The further back the blonde ancestor is, the lesser the chances the recessive gene has been passed on to you.

    However, it is possible that there are recessive genes that have been passed on, so the above is not perfect. Knowing the hair colour and number of children in each generation can give a better model for coming up with odds.

    For example, if you have one blonde grandparent, but three brown siblings that partnered with blonde partners and each had two brown-haired children, your chances of having a recessive blonde gene are so much lower.

    From you blonde grandparent, your parent has a 50% chance of having a recessive gene. If your parent has the recessive gene, you and each of your siblings have a 50% chance of having a recessive gene. If your sibling has a recessive gene, then each of their children have a 50% chance of having blonde hair. Given that information, there is only a 1½% chance that your parent would have a recessive blonde gene and thus only a 0.75% chance they passed it on to you, leaving your child with only a 0.19% chance of having red hair.

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    MsMummy  (07-06-2012)

  6. #65
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    Quote Originally Posted by sweetseven View Post
    The big issue is whether you have two brunette genes or a recessive gene. In my opinion, since you mentioned blondes in your immediate family, it is likely you have a recessive blonde gene. That combined with a red gene from your partner could (in my opinion) result in a red haired child.

    Since your partner is strawberry blonde, I would expect he would have a blonde and a red gene, so ...

    If you have both a brown and blonde gene, and your partner has a red and blonde gene, that gives a 50% chance of brown haired offspiring (brown gene from you), a 25% chance of red haired offspring (blonde gene from you and red from partner), and a 25% chance of blonde haired offspring (blonde gene from both).

    If either of your parents are blonde, then you have a blonde gene, so the above is true and thus you have a 25% chance of an offspring being red-haired.

    If both your parents are brunette but you have a blonde sibling, then both your parents each have both a blonde and brunette gene, so you have a 66% chance of having a brunette and blonde gene, thus a 17% chance of an offspring being red-haired.

    If both your parents are brunette, and you have two blonde grandparents (one on each side) then both your parents will have a blonde and brunette gene and thus again you have a 66% chance of having a recessive blonde gene which means a 17% chance of an offspring being red-haired.

    If both your parents are brunette and you have only one blonde grandparent but the other branch has only brunettes going back for many generations ... then it is fairly safe to assume (but not guaranteed) that that parent has two brunette genes, but the parent from the blonde grandparent will have one blonde gene, giving you a 50% chance of having a blonde gene and thus a 12½% chance of an offspring being red.

    -------------------

    In short B = brown, b = blonde, r = red.

    For your children, either
    (no recessive blonde gene)
    BB (brown) + rb (red) = Bb (brown) | Br (brown)
    or
    (recessive blonde gene)
    Bb (brown) + rb (red) = Bb (brown) | Br (brown) | bb (blonde) | rb (red)

    So either 0% chance red or 25% chance red

    For yourself
    (brown parents, blonde sibling or two blonde grandparents, 66% chance recessive)
    Bb (brown) + Bb (brown) = BB (brown) | Bb (brown) | Bb (brown) | bb (blonde)
    or (brown parents, one blonde grandparent, other side brown to way back, 50% chance recessive)
    Bb (brown) + BB (brown) = BB (brown) | Bb (brown)

    The further back the blonde ancestor is, the lesser the chances the recessive gene has been passed on to you.

    However, it is possible that there are recessive genes that have been passed on, so the above is not perfect. Knowing the hair colour and number of children in each generation can give a better model for coming up with odds.

    For example, if you have one blonde grandparent, but three brown siblings that partnered with blonde partners and each had two brown-haired children, your chances of having a recessive blonde gene are so much lower.

    From you blonde grandparent, your parent has a 50% chance of having a recessive gene. If your parent has the recessive gene, you and each of your siblings have a 50% chance of having a recessive gene. If your sibling has a recessive gene, then each of their children have a 50% chance of having blonde hair. Given that information, there is only a 1½% chance that your parent would have a recessive blonde gene and thus only a 0.75% chance they passed it on to you, leaving your child with only a 0.19% chance of having red hair.
    Thanks so much for calculating that for me! It's a funny gene the red-haired gene, and it's always something I wonder about, but figured it unlikely given the absent of redheads in my family, but not impossible given I had a blonde grandparent on each side.

  7. #66
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    So based on my above calculations, that gives your potential child a 17% chance of having red hair. (I just thought I should add that because I did my usual run-away with heaps of numbers there.)

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    What were the chances of us having a red haired baby? (sorry brain refuses to understand the above equation)

    My side: Grandfather-brown, Grandmother-red, father -brown, mother-brown, brother brown, me-brown.

    DPs side: Grandfather-red, grandmother-brown, father-red, mother-brown, sister-brown, DP-brown.

    We have one brown haired child and one red haired child.

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    Haven't read the replies ... But my dad has red hair - I have brown as does exH ... DS1 has red hair DS2 has light brown.

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    Quote Originally Posted by IndigoJ View Post
    What were the chances of us having a red haired baby? (sorry brain refuses to understand the above equation)

    My side: Grandfather-brown, Grandmother-red, father -brown, mother-brown, brother brown, me-brown.

    DPs side: Grandfather-red, grandmother-brown, father-red, mother-brown, sister-brown, DP-brown.

    We have one brown haired child and one red haired child.
    Quite good- 50%
    Opps! Scrap that- just did a punnett sq you have a 25% chance. duh! (me)
    Last edited by magic star; 08-06-2012 at 06:43.

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  12. #70
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    Quote Originally Posted by IndigoJ View Post
    What were the chances of us having a red haired baby? (sorry brain refuses to understand the above equation)

    My side: Grandfather-brown, Grandmother-red, father -brown, mother-brown, brother brown, me-brown.

    DPs side: Grandfather-red, grandmother-brown, father-red, mother-brown, sister-brown, DP-brown.

    We have one brown haired child and one red haired child.
    Given that you both have brown hair and already have a red-haired child then both you and your DP have recessive genes and thus the rest of your ancestries were unnecessary. I disagree with Silverspoon however and say that the chances are 25% not 50%.

    Br & Br = BB | Br | Br | rr

    Quote Originally Posted by Theboys&me View Post
    Haven't read the replies ... But my dad has red hair - I have brown as does exH ... DS1 has red hair DS2 has light brown.
    Exactly the same situation as IndigoJ, both you and exH have a recessive gene and thus any potential future child of both of you would have a 25% chance of red hair.
    Last edited by sweetseven; 07-06-2012 at 22:42.


 

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