What are some of the dominate genes?

Question

like frckles and hair and eye color... like with hazle eyes and green eyes, which one would be more dominate?

Answer 1

well i dont know about the apperance but the most dominant gene is p53 the cancer gene take care of p53 and ull live longer

Answer 2

Eye color, despite what you might have learned, does not work based on the dominant/recessive scale.

Multiple genes control eye color. Each gene carries certain amounts of melanin (pigments) that color your eyes. If you have a lot of genes with a lot of melanin, you will have dark, brown eyes. If you have genes that don't have a lot of melanin, then you will have blue eyes. If you have some genes with a lot, and some genes with not much, you will have light brown, dark blue, and various shades of green and hazel.

The reason why it is thought to be dominant is because someone with brown eyes has a LOT of dark pigment, whereas someone with blue eyes probably does have a little bit of dark pigment, but not enough to make their eyes darker. So, their kids will all (or most of them) will wind up with brown eyes because of how much pigment the one parent has.

If you want some other dominant traits, you have: curly hair, free earlobes, Huntington's disease, more body hair, A and B blood types (these are co-dominant over type O), and Cleft chin. There are too many to count, but these are a few.

Answer 3

Eye color - brown is dominant over blue and green but green is dominant over blue

Fingers - having 6 digits is dominant over 5

Hair - having a "widdow's peak" hairline in front is dominant

Ears - having free earlobes is dominant over attached.  

There is also incomplete dominance such as that found in flowers and co-dominance such as blood type where in a heterozygous individual, both types are expressed.  Contrary to another answer, eye color does fall into the dominant / recessive category.  I will attach an explanation about dominant and recessive genes, using eye color, which you can use to predict the genetic outcome of children from the parents' genetic make up (you can work backwards too but it is a bit more difficult).  I will also explain how incomplete dominance works using flowers as an example.  I will explain about punnett squares and it might be fun for you to draw one as I explain:

Brown eyes (B) are dominant. Blue or green eyes (b) are recessive to brown, (although they are dominant to blue). What recessive means is that if there is ever a combination of a dominant gene with the recessive gene, the dominant is always exhibited. The easiest way to understand eye color and heredity is to draw a punnett square. I'll try to explain and you draw it on paper as I do so. Draw a square. Inside draw a cross so there are 4 sections. Now we add the genes. If either parent is homozygous (home = same) for brown eyes (B), every offspring will have brown eyes. However if both parents are heterozygous for eye color, that is, each has a dominant and a recessive gene (Bb) they will have brown eyes but carry the recessive gene. Now go to your square. Put dad on top. Above the top left square put a B and above the top right square put a b (This represents dad's Bb genetic make up for eye color). Now go to the left side. Next to the upper left box put a B and next to the lower left box put a b. (This is mom's Bb make up.) Now combine them. The upper left box would have a BB. The upper right box would have a B (from mom) and a b (from dad). The lower left box would have a b (from mom) and a B (from dad). The lower right box would have a bb (from each mom and dad). If you look at the results you will have 1 offspring that is homozygous for brown eyes (BB) and has brown eyes. You will have 2 offspring that are heterozygous for brown eyes (Bb) and have brown eyes, and 1 offspring that is homozygous for recessive blue or green eyes (bb).

The example above is one of complete dominance = whenever there is a B, brown will be exhibited. There is also incomplete dominance where neither gene is dominant. An example is flower color. If R represents red and Rp = pink and pp = white this is what happens. Make your box. Cross a red flower (R & R above the top 2 boxes) with a white flower (rr next to the two left boxes). When you cross them, all four boxes have Rr which means you have 4 pink flowers. Now let’s cross 2 pink flowers. Draw your box. Above the top left and right put R and r (genes for pink). Next to the left top and bottom put R and r. Now cross them like you did with eyes. You will end up with one RR red flower, 2 Rr pink flowers and one rr white flower.