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Archiver > DNA-NEWBIE > 2010-03 > 1268066572


From: Andy Micklethwaite <>
Subject: Re: [DNA-NEWBIE] Color Blind
Date: Mon, 08 Mar 2010 16:42:52 +0000
References: <56172.92341.qm@web83915.mail.sp1.yahoo.com>
In-Reply-To: <56172.92341.qm@web83915.mail.sp1.yahoo.com>


Hi Nancy

I can't confirm or deny the genetics but it doesn't look right to me. My mother was colour blind. Neither I nor my sister are. But one of her sons is. Colour blindness in women is rare but more common in men (about 10% in the UK from memory).

HTH Andy.

PS Just looked at Wiki http://en.wikipedia.org/wiki/Color_blindness
It has a section on the genetics

At 15:57 08/03/2010, you wrote:
>>From my high school biology class more than 50 years ago, I learned that the color blind trait is passed from the father to his daughters. The daughters can carry the gene but the sons don't.
>For a girl to be color blind, her father has to be color blind and her mother has to carry the gene. That was the simple way I was taught.
>
>A situation in our family was just brought to my attention. My father-in-law was color blind. Both of my sisters-in-law carry the gene. S-i-l A has two sons, one is color blind the other is not.
>S-i-l B has two sons, both are color blind.
>
>So far everything follows what I was taught several years ago.
>
>S-i-l B also has a daughter. The daughter is not color blind, but her son is. His father is NOT color blind.
>
>Is this unusual or can the mother pass the gene to the daughter? If she can, I guess the daughter can have a son who is color blind.
>
>I have not really studied this, but I listen closely when I hear anyone mention color blindness.
>
>Nancy W. in Louisiana
>
>
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