Re: Anyone here colorblind?

On 7 mei, 22:57, Greg Goss <go...@[EMAIL PROTECTED]
> wrote:
>
<snip>
> There are two types of vision receptor, and one of those types is
> divided into three subtypes.
>
> Evolution has to balance the need for very sensetive night vision
> "rod" receptors versus the need for colour-sensing "cone" receptors.
> There are three kinds of cone sensors which give us our three primary
> colours.  The gene coding for the red sensor is fairly new in
> evolutionary terms, and so only exists in one place, and in a BAD
> place on the X chromosome.  Men have no spare copy of this gene, so,
> if the only copy goes bad, you don't get red.
>
> I don't know what happens if you don't make red-detecting cones.
 
<-------

"the rays are not colored"  (I think that was Newton)

<snip>

regards,

robert schreuder