Harry's looks

[Milz]

No: HPFGUIDX 18730

--- In HPforGrownups at y..., rcraigharman at h... wrote:
> --- In HPforGrownups at y..., "Milz" <absinthe at m...> wrote:
> > 
> > Harry's green eyes could also be explained by gene expression. 
For 
> > Lily to have green eyes, she would have to have had both 
recessive 
> > genes for green eyes (homozygous recessive). James would have had
> > to  have the dominant gene and the recessive gene (heterozygous).
> > If James were homozygous dominant, Harry would have had dark eyes.
> 
> Punnett squares notwithstanding, eye color is determined by a
> combination of at least three genes: bey2, on chromosome 15,
> (brown/blue), gey on chromosome 19 (blue/green), and bey 1, on
> chromosome 15, (central brown eye color).  So, it's a bit more
> complicated than a binary trait.
> 
> ....Craig

I know, but illustrating a binary trait is less messy, 
diagramatically speaking and it still gets the general point across 
that relying solely upon phenotype can be deceiving.

:-) Milz who eyes cross then glaze over at the sight of busy diagrams 
and charts.