How does evolution explain different colored eyes in siblings?

Question

Come on you people claim that evolution is in control of your genetics. How does this happen?

Answer 1

Please let me know when someone finds out! God Bless!!

Answer 2

Well siblings have different eyes due to genetics and there ancestors having different eyes which should be pretty obvious.....
But I'll still pretend your question holds water but I'm just gonna copy and paste an article. The eye is a low blow for scientists though since it is a very complex organ that we do not have enough information on. But just because we don't know something at the moment does not mean that the notion god created us against all evidence is true.


When evolution skeptics want to attack Darwin's theory, they often point to the human eye. How could something so complex, they argue, have developed through random mutations and natural selection, even over millions of years?

If evolution occurs through gradations, the critics say, how could it have created the separate parts of the eye -- the lens, the retina, the pupil, and so forth -- since none of these structures by themselves would make vision possible? In other words, what good is five percent of an eye?

Darwin acknowledged from the start that the eye would be a difficult case for his new theory to explain. Difficult, but not impossible. Scientists have come up with scenarios through which the first eye-like structure, a light-sensitive pigmented spot on the skin, could have gone through changes and complexities to form the human eye, with its many parts and astounding abilities.

Through natural selection, different types of eyes have emerged in evolutionary history -- and the human eye isn't even the best one, from some standpoints. Because blood vessels run across the surface of the retina instead of beneath it, it's easy for the vessels to proliferate or leak and impair vision. So, the evolution theorists say, the anti-evolution argument that life was created by an "intelligent designer" doesn't hold water: If God or some other omnipotent force was responsible for the human eye, it was something of a botched design.

Biologists use the range of less complex light sensitive structures that exist in living species today to hypothesize the various evolutionary stages eyes may have gone through.

Here's how some scientists think some eyes may have evolved: The simple light-sensitive spot on the skin of some ancestral creature gave it some tiny survival advantage, perhaps allowing it to evade a predator. Random changes then created a depression in the light-sensitive patch, a deepening pit that made "vision" a little sharper. At the same time, the pit's opening gradually narrowed, so light entered through a small aperture, like a pinhole camera.

Every change had to confer a survival advantage, no matter how slight. Eventually, the light-sensitive spot evolved into a retina, the layer of cells and pigment at the back of the human eye. Over time a lens formed at the front of the eye. It could have arisen as a double-layered transparent tissue containing increasing amounts of liquid that gave it the convex curvature of the human eye.

In fact, eyes corresponding to every stage in this sequence have been found in existing living species. The existence of this range of less complex light-sensitive structures supports scientists' hypotheses about how complex eyes like ours could evolve. The first animals with anything resembling an eye lived about 550 million years ago. And, according to one scientist's calculations, only 364,000 years would have been needed for a camera-like eye to evolve from a light-sensitive patch.

Answer 3

I don't claim to be a evolutionary scientist but I would say yes and no.

First evolution explains the creation of a complex gene system or DNA.

The dominant and recessive genes and the various mixtures there off create the different color of eyes. In fact, I believe there is about 7-15 genes that need to be aligned in a certain order to determine eye color. it is not as simple as the two gene one dominant the other recessive or both recessive or both dominant as we are shown in High School science class.

The interplay in dominant and recessive genes allows in the evolutionary theory adaptations for survival to take place as well as genetic mutations.

Answer 4

Because, as evolution states, each generation will be genetically new. Animals, like humans, reproduce genetically independent offspring, which can cause different eye colors.

Answer 5

It is not evolution that does this it is genetics.....

The gene is like flipping a coin and landing on either a dominant or recessive side. Each genetic strand or link is a different flip.

Because of this even our full blooded siblings statistical usually only have 50% of the exact same genes we do.

Answer 6

Eye color can not be explained by evolution but by genetics, but not genetics in the simple terms that Mendel explained it. Eye color is determined by a combination of genes, not by simple dominate and recessive genetic understanding. Evolution can only explain how the environment leads to the dominance of different eye colors. In cold climates over time skin color and eye color will become lighter and in hot climates skin color and eye color will become darker.

Answer 7

Evolution is not in "control" of our genes. It is an observed process. Hereditary variation and natural selection is Darwin's explanation for how this process occurred.

An early, strategy that developed early on is sex. Even though each progeny only carried half of one parent's genes, the increase in variation more than compensated for most multicellular organisms. Eye color is likely just random variation, but one obvious benefit is in our immune systems. Changing the 'codes', so to speak with every generation makes it harder for a disease to develop a specific strategy to fight.

Other useful things like lactose tolerance and skin coloration (or lack thereof) can develop more rapidly using this system.

Answer 8

Uh...that would be genetics, actually. I have green eyes, my father has blue eyes, my brother has blue eyes, and my mother has brown eyes. Green is a very rare color, blue and brown are the most common.

Edit: You can find out what your chances are to have different genetic traits by doing a Punnett Square (which was invented by a Monk, by the way.)

Answer 9

that's a genetic trait what's it got to do with evolution ?

Answer 10

.... what do you think evolution is? Do you know absolutely nothing about genetics? You should know better than to ask this.

Answer 11

Pssst! This is the Religion & Spirituality room, not the Biology room. Pass it on!