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Re: biology question for libfemme
libfemme ( 09/30/2003, 03:56:30 )For every trait (eye color, blood type, etc.) you have 2 genes that could make the trait. One came from your father and the other came from you mother. Which one gets used?Well it depends upon a number of factors. Some genes for reasons we don't know just seem to always get used, what biologists called expressed. If you have even one copy of this gene it will be the one that gets used. This is called a dominant gene. Brown eyes are dominant. You need to get just one gene from one of your parents and you will have brown eyes show up.Blue color is what is called recessive. If you get a blue eye gene from one of your parents it will be used, expressed only if you the other gene you have for eye color is also blue.So if you are a child that has two genes for brown eyes, one from mom and one from dad you will be Brown eyed.If you are a child with only one gene for brown eye and the other for blue, you will be Brown eyed.Since both children have brown eyes you can't tell from looking at them if one is carrying a recessive blue eye color gene. But suppose this child grows and marries a spouse who also has brown eyes but is carrying a recessive blue eye gene.In that case the odds are that most of their kids will have brown eyes but some could easily have blue. Why well, if one parent gave the off spring his blue eye recessive gene and the other parents did the same by random chance, then the child would have 2 blue eye color genes.But for this to happen you have to have, somewhere back in your family history an ancestor who passed on the blue eye gene. It's possible for it to be several generations back and you not realize you are carrying it. This also happens some disease causing genes.You may be carrying a gene that can cause a defect in an offspring but it is a recessive gene so it never gets expressed, in other words you never see it, except if by chance the other parent also carries one of those disease genes.Recessive genes are neither good nor bad. They are just versions of a gene that will yield to dominant version. Brown eyes are dominant over blue eyes. Nobody knows why exactly yet, we just can observe that blue eye color is recessive.
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