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Motley and stripe questions.

Nanci said:
According to that, only one of me and my two sisters is the child of both of my parents! Mom had brown eyes, Dad blue, one sister with brown, one sister with blue, me with green.
Click to expand...

Not at all... Mom was carrying one brown, one green. Dad was carrying one blue, one green. Brown is dominant over blue. Blue is dominant over green. You got both greens. One sister got a blue and a green. The other got a brown and either a blue or a green.

This is a bit simplified, of course, but the basics work. I have green eyes as well. Mom has hazel, Dad has green. My brother is hazel.
 
we're getting off topic, but how would you call it for ppl that actually have one blue and one brown or green eye?
 
Odd-eyed humans are unusual. There are several possibilities, but since we can't really do controlled human breeding to investigate them, we don't know which one(s) it might be.
1) the odd-eyed person originated in two fertilized eggs with different eye color alleles, that fused early enough to become one embryo that grew up to be the person
2) the odd-eyed person is heterozygous, say 1 blue allele & 1 brown allele, but the brown genetic information doesn't get activated & used to make eye color in one of the two eyes
3) the odd-eyed person is a homozygote for, say, brown, but the gene doesn't get turned on, or only turned on partway, in one eye.
These are some of the possibilities I can think of, there may be more options.
 
I don't know what that phenotype for two different eye colors is called, but eye color isn't a simple Mendelian trait. It's polygenic. There are at least 3 known genes on three different chromosomes (and here I do not mean alleles, but three different genes at three different loci--like the amel gene and anery gene and motley gene are at three different loci) that control eye color, and there are probably more than that that influence the expression of those three genes.

You can't tell much about your parents (or not) with those silly eye color punnet squares--eye color simply isn't inherited in a way that can be described by punnet squares. But your blood type? Yes. That can get you into trouble . . .

Jessica--if you breed a a homozygous stripe to a homozygous motley you will get 100% phenotypic motleys that are heterozygous for the stripe and motley alleles. Just like if you breed a homozygous A blood type individual to a homozygous O blood type individual, you will get all phenotypic A blood type offspring with a genotype of AO.

Now, what your motleys actually look like seems to be dependent on a lot of other things. Probably because the actual expression of that allele is dependent on others. I wouldn't be surprised to find that pin-stripe motley is a polygenic trait and so is regular motley, each with their own gene somewhere else that affects how the motley allele is expressed. How we'll find that out, I have no idea, since that level of complexity is not very accessible through breeding trials.
 
*nods* I knew I was over simplifying a great deal, but as an analogy, it kind of stands. The logic of motley and stripe work is there at least.
 
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