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On eye colours

Anonymous Tue 15 Sep 06:00:34 2020 No.12122526 View Reply Original Report

Quoted By: >>12122531 >>12122549 >>12122600 >>12122798

Me: blue eyes. My dad: blue eyes. My mum: green eyes
My gf: brown eyes. Her dad: brown eyes. Her mum: blue eyes.

Genetically/statistically, what are the chances of kids being brown-eyed?
25%? (1 out of 4 grandparents brown-eyed)
50%? (1 out of 2 parents being brown-eyed?
75%? (Brown eyes are a dominant gene)

Anonymous

Anonymous Tue 15 Sep 2020 06:02:25 No.12122531 Report

Quoted By:

>>12122526
100% gay

Anonymous

Anonymous Tue 15 Sep 2020 06:10:26 No.12122549 Report

Quoted By: >>12122561

>>12122526
Damn, blue eyes truly is master race. My entire family, grandmothers, fathers, aunts, sisters and brothers all have brown, I have blue. It's a recessive gene, both parents need the alleles.

Anonymous

Anonymous Tue 15 Sep 2020 06:17:51 No.12122561 Report

Quoted By: >>12122690

>>12122549
So all my kids will likely have brown eyes? I'd rather it be so that some of my kids will have brown, some will have blue, so that between my children, there will be ones who have my eyes and ones who have my gf's eyes. But is that unlikely to happen if her alleles are dominant?

Anonymous

Anonymous Tue 15 Sep 2020 06:21:52 No.12122576 Report

Quoted By: >>12122580

perceived eye color is frequently different from the alleles present

Anonymous

Anonymous Tue 15 Sep 2020 06:23:04 No.12122580 Report

Quoted By: >>12122594

>>12122576
Why does this occur?

Anonymous

Anonymous Tue 15 Sep 2020 06:26:03 No.12122594 Report

Quoted By: >>12122600

>>12122580
affected by a large amount of genes
>Eye color is an inherited trait influenced by more than one gene.[13][14] These genes are sought using associations to small changes in the genes themselves and in neighboring genes. These changes are known as single-nucleotide polymorphisms or SNPs. The actual number of genes that contribute to eye color is currently unknown, but there are a few likely candidates. A study in Rotterdam (2009) found that it was possible to predict eye color with more than 90% accuracy for brown and blue using just six SNPs.[15] There is evidence that as many as 16 different genes could be responsible for eye color in humans; however, the main two genes associated with eye color variation are OCA2 and HERC2, and both are localized in Chromosome 15.[9]

Anonymous

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Anonymous Tue 15 Sep 2020 06:32:11 No.12122600 Report

Quoted By:

>>12122526
Based off what I can remember from high school biology, 50%.
Considering her mum is blue eyed, your gf should be heterozygous while you are probably homozygous recessive. From that, half should be blue eyed and half brown eyed (with a chance of them producing blue eyed children depending on their partners)

As >>12122594 said though, eye colour is more complicated than a single gene (as you could probably guess from the variety of eye colours out there) so I wouldn't say anything is certain.

Anonymous

Anonymous Tue 15 Sep 2020 07:06:06 No.12122690 Report

Quoted By:

>>12122561
If both parents are brown with blue alleles, there's a 1/4 chance the kid will have blue eyes. Both of you need to be carriers of the gene. One expressed blue and one carrier gives 1/2, in the easiest understanding, but there are more factors like the other poster said

Anonymous

Anonymous Tue 15 Sep 2020 07:40:32 No.12122798 Report

Quoted By:

>>12122526
50%. Your girlfriend must have one blue allele from her mother and one brown from her father, so it's 50%.

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