Ok is it true that two blue eyed parents can only have a blue eyed child?

In Biology I was taught that two blue eyed parents can only have a blue eyed child. Recently a coworker of my sisters brought her twins to work, they had brown eyes. She has bright blue eyes and so does her husband, she said her husband is the father of her twins.

Do you think she had to of had an affair? Could she be telling the truth? Was I taught something that wasn't true?

What do you think? Asked by Neversleepsawink 44 months ago Similar questions: true blue eyed parents child Family.

Similar questions: true blue eyed parents child.

My Mendel Punnett square says two blue-eyed parents produce only blue-eyed babies. I took Genetics in college and learned the same as you. However, in researching a little on the website listed below athro.com/evo/gen/inherit1.html I found that it is possible but very rare.

Below is a direct quotation from the website (I did the folding and titillating): In humans three genes involved in eye color are known. They explain typical patterns of inheritance of brown, green, and blue eye colors. However, they don't explain everything.

Grey eye color, Hazel eye color, and multiple shades of blue, brown, green, and grey are not explained. The molecular basis of these genes is not known. What proteins they produce and how these proteins produce eye color is not known.

Eye color at birth is often blue, and later turns to a darker color. Why eye color can change over time is not known. An additional gene for green is also postulated, and there are reports of blue eyed parents producing brown eyed children (which the three known genes can't easily explain mutations, modifier genes that suppress brown, and additional brown genes are all potential explanations).

I personally would be suspicious, but, hey, if Dad isn't worried, why should we care? But I would not buy land or a used car from this woman, LOL. Sources: website as given above .

No, it's not true. People are often very confused by eye color genetics because reality seems to fly in the face of the simple genetics we are taught in school. Two blue-eyed parents can produce green or brown-eyed children.

Eye color is not the simple decision between the brown (or green) and blue versions of a single gene. There are many genes involved and eye color ranges from brown to hazel to green to blue to… How does eye color work? Eye color comes from a combination of two black and yellow pigments called melanin in the iris of your eye.

If you have no melanin in the front part of your iris, you have blue eyes. An increasing proportion of the yellow melanin, in combination with the black melanin, results in shades of colors between brown and blue, including green and hazel. What we are taught in high school biology is generally true, brown eye genes are dominant over green eye genes which are both dominant over blue eye genes.

However, because many genes are required to make each of the yellow and black pigments, there is a way called genetic compensation to get brown or green eyes from blue-eyed parents. Genetic Complementation The best way to illustrate how this might happen is with an example. Let’s say there is a genetic pathway made up of four genes (cleverly named A, B, C, and D) that are needed to make brown eyes.

A mutation in both copies of any one of these genes results in blue eyes (these mutations are denoted with lower case letters, a, b, c, and d). Now let’s say that dad has blue eyes because of a mutation in both his copies of gene A and mom because of a mutation in both her copies of gene D. As I am sure you know, we have two copies of each gene, one from our mom and one from our dad.

If either parent gives you a brown version of a gene, it will be dominant over the blue copy. Let’s suppose that mom gives you a brown copy of gene A and dad gives you a brown copy of gene D. What color eyes would you have?Brown.(The same argument works for green eyes as well.) Another common genetic process that could be responsible for brown eyes from blue-eyed parents is called recombination.

When eggs and sperm are made, only one of a pair of chromosomes gets put into an egg or sperm. Before this happens, there is a bunch of DNA swapping that goes on between the pair of chromosomes. Sometimes when the DNA is swapped or recombined, DNA mutations get fixed.

Recombination Again, an example can show how this might work. Imagine dad has blue eyes because of a mutation at the front end of one copy of his eye color gene and a different mutation at the back end of the other copy of the gene. Each gene has a single mutation but at different places in the gene (see Figure 2).

Now imagine that when his sperm is being made, the middle part of the eye color gene is switched between the two genes resulting in one brown eye gene and one blue eye gene with two mutations. Now dad can produce a brown-eyed child.(Again, the same argument works for a green eye gene as well.) Another way to get brown eyes from blue-eyed parents is for something in the environment to affect the eye color gene. Even though there are well-documented cases in which this happens, the reasons for it are pretty poorly understood.

There are cases, for example, of certain drugs changing a person’s eye color—the environment clearly has changed what happened to eye color in this case. Another possibility is that a gene is on or off for some reversible reason instead of an irreversible change in DNA. In this case, something in the environment reverses the change, turning the eye color gene back on or off.

Source: Ask a geneticist Goodbye!'s Recommendations Jakks EyeClops Bionic Eye Amazon List Price: $49.99 Average Customer Rating: 4.5 out of 5 (based on 159 reviews) .

While it's rare... While it's rare, it can still happen. One of the parent's blue eyes might be due to a defect in their gene that makes the darkening agent. Sometimes during transcription the DNA proofreading mechanism fixes small errors, or DNA transposition fixes an earlier transposition that broke the gene.

Or maybe both parents had damaged brown genes, giving them blue eyes, but when their genes combined, the good members of their genes got selected.

Not 100% true. The genes that control eye color contain multiple pairs of recessive and dominant pairs, instead of the single pair that we learned about in school. Scientists have found 3 separate genes that affect eye color to some degree, and do not fully understand how they interact, or know all of their possible combinations and permutations.

Your analysis of eye color is true 99.999% of the time. Blue eyed couples have blue eyed children, since they only have the recessive blue eyed gene, and can donate no other gene. That is the single gene analysis.

With the other genes identified, there are exceptions to this rule. The exceptions should be fairly rare though. You did not say whether the twins were identical.

If they are, then they have the same genes, and this could be a single example of that rare exception. If they are fraternal, then this would be 2 examples of this rare exception happening at the same time, and maybe someone should have a talk with the husband about getting a paternity test. I would not want to be the one to suggest it though.

I hope this helps. Sources: en.wikipedia.org/wiki/Eye_color .

It isn't true Apparently you didn't learn about Mendel and his pea experiments in biology and how parents' recessive genes can pair up in a child, which is what happened with the twins. My parents both have brown eyes and so does my younger brother but I have green eyes and my mother did not have an affair. anthro.palomar.edu/mendel/mendel_1.htmThis website shows his experiment and explains how traits are or are not passed along to new generations.

I hope this clears up your thoughts about a possible affair. Sources: biology classes itybity's Recommendations The Monk in the Garden: The Lost and Found Genius of Gregor Mendel, the Father of Genetics Amazon List Price: $14.00 Used from: $0.92 Average Customer Rating: 3.5 out of 5 (based on 21 reviews) From Mendel's Peas to Genetic Fingerprinting: Discovering Inheritance (Chain Reactions) Amazon List Price: $34.29 Used from: $15.00 .

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