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"Annette" <mcintoshNOSPAM@iprimus.com.au> wrote in message
news:mcintoshNOSPAM-1907012050060001@148.c.005.mel.iprimus.net.au...
> In article <995513631.418860@atlas.corp.au.home.com>,
> "Prarie Dawn" <prarie dawn   @hotmail.com> wrote:
>
> > If the mother has red hair, and the father has fair hair (that has
> > darkened since birth), what are the odds of their child having red
> > hair or blonde hair?
>
> I seem to recall a simplistic genetics lesson from high school (in
> university I learned things are never as straightforward, so someone
> may correct me...).
>
> IIRC, the blonde hair gene (call it "B") is dominant over the red hair
> gene (call it "b").
>
> This means that for someone to be a redhead, they have to have both
> hair-colour genes "b", ie. they are bb.  Someone with blonde hair
> can be either Bb, or BB, as either of these genotypes (the genetic
> compositions) will produce the same phenotype (the outward appearance).
>
> The mother must be bb to have red hair.  The chances of the children
> having a certain hair colour depend on the genotype of their father.
>
> As a blonde, he may be BB.  If this is the case, the only hair-colour
> gene type he can give to any child is a B.  Any child of this couple
> will therefore be blonde.
>
> The father will still be blonde if he is Bb, however a hair-colour
> gene he contributes to a child may be either B or b.  The mother can
> only contribute a b, which means that there is a 50% chance of any
> child of this couple being a Bb (a blonde) and a 50% chance that any
> child is a bb (a redhead).
>
> Annette.