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Thread: Recessive and Dominant Traits

  1. #1 Recessive and Dominant Traits 
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    Lately i have been looking and have become interested in recessive and dominant genes and how they give the results they do.

    Supposedly, blue eyes are a recessive trait and brown eyes are a dominant trait. So for blue eyes you need bb and for brown you can have Bb, the same goes for hair colour also. I also read on the web (not wikipedia, for a change) that recessive genes are faulty, needing two recessive alleles to actually show.

    My question is if these are faulty, or even if they are not, does a recessive trait like blue eyes have an influence on short-sightedness or other diseases, i have no actual proof or evidence, but in my class people with eye problems; out of 30 people about 14 wear glasses, roughly 9 of them have short-sightedness and blue eyes and 2 have brown eyes but long-sightedness.

    Is short-sightedness a recessive disease (if there is such a thing) or is this just coincidence?


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  3. #2  
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    Blue eyes tend to be more susceptible to sun damage. Because of this, chances of sight problems are higher than with darker eye colors like brown eyes.

    Really, brown-eyes are better at resisting damage than other types. So blue-eyes can be considered faulty in that area.


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  4. #3  
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    think dominance and recessive is a little more complicated than one generation. two blue eyed parents can and do have brown eyed babies, as well as two brown eyes having a blue eyed. the grandparents or even several generations back can influence the final product. your probably getting a few spouses in trouble, with that thought. some folks have had children that appear to be from another race and learn of a mixed relationship well into the past.

    as to visual perfection, this may be more genetics than acceptance to light rays by color. few kids with two well sighted parents require glasses or have good vision. i would suggest also that most (not all) kids are wearing glasses to enhance future vision, not all really requiring to have 20-20.
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  5. #4  
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    Thanks for that information. It's pretty interesting stuff, i have become quite short-sighted over the past year and i have blue eyes, my mum has greeny-brown eyes (she is very short-sighted, but fine with glasses) and my dad has greeny-brown eyes, but me and my sister both have blue eyes. It just made me think! Very Interesting.

    Oh yes guys, do you think there is a higher success of laser eye surgery depending on the eye colour, whether it be brown, green, blue or any other shade of colour?
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  6. #5  
    Forum Freshman Kosta's Avatar
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    Eye problems are far more the result of other genes than that of eye color. Genes that determine the make up of the eye (structural) are the more important ones to look at. While blue eyes may be more suseptible to damage etc. the main reason why someone would have poor eye sight is because of recessive traits in other genes that relate to the eye.

    Genes responsible for the phenotype of eye color is the wrong place to look.
    In order to make an apple pie from scratch, you must first create the Universe. - Carl Sagan
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