My mother has dark brown eyes and my father has greyish eyes, my mum's father had brown eyes and so did my dad's father, so how did i end up with blue eyes? (and they are my real parents,i look like them both)
2007-01-12 12:52:55 · 19 answers · asked by Anonymous in Science & Mathematics ➔ Biology
If you take a look in to the study of genetics, Brown eyes are the dominant color. Each person has two genes for each feature/aspect of their body. Gray/Green and Hazel eyes are all mutations of these genes. Brown and Blue are true genes without mutation. Your mom must have had Bb (meaning that she had the brown gene dominant (B) and the blue gene (b) recessive (not dominant). Your dad on the other hand, having gray eyes probably has something related to bb (blue and blue) and one or both is a mutation. YOU, having blue eyes, received two b (or blue) genes. This means, should you have a child with someone who also has blue eyes, your children will not have brown eyes but blue, green, gray or hazel. Blue would be true, unmutated genes from both of you as the rest would be a mutated gene.
Bb + bb equals one of two options Bb or bb and it's a 50% chance of either.
2007-01-12 13:01:48 · answer #1 · answered by Just me 3 · 1⤊ 1⤋
Yes, brown eyes are dominant over blue. However, two brown eyed parents can have a blue eyed child if they carry a recessive blue along the way somewhere. I have three children, their father has brown/hazel eyes, I have brown eyes...2 of my kids have brown eyes, and one has blue. Odd but true.
2007-01-12 21:07:33 · answer #2 · answered by nerdy girl 4 · 0⤊ 0⤋
Yes, brown eyes are dominant over blue eyes. What we have learned from this is that your mother carries a heterozygous genotype meaning she has both a brown eye allele and a blue eye allele, explaining how you have received the blue eye allele from both parents. Your father's grayish eyes are almost certainly a variation of blue, meaning your father, and you, are by definition homozygous for blue eyes. This simply means that both of you carry only blue eye alleles, which is the case for all blue eyed people.
2007-01-12 21:02:24 · answer #3 · answered by Jack D 2 · 0⤊ 0⤋
Traits are very strange. But yes brown is dominant. It's possible that somewhere deep in your heritage someone had blue eyes. Because there is more than just blue and brown eyes (hence the gray), the genes can work out that you have blue eyes.
2007-01-12 20:57:20 · answer #4 · answered by Anonymous · 0⤊ 0⤋
because both parents may well have carried the recessive blue eye gene, and if you got one of these from each then you would have no brown eye genes to dominate and give you brown eyes, and end up with blue ones instead! its more unlikely (in this case a 1 in 4 chance) but certanly possible!
2007-01-12 20:56:37 · answer #5 · answered by James W 3 · 0⤊ 0⤋
people with brown eyes can carry the recessive allele for blue eyes, but since brown is dominant it is shown in the parents/grandparents. however, when an offspring happens to get a recessive allele from both parents, he/she will have blue eyes
2007-01-12 20:56:33 · answer #6 · answered by Anonymous · 1⤊ 0⤋
Both your mom and your dad carry the blue gene for eyes. Your mom has a brown gene and a blue gene and your dad has two blue genes(gray is a form of blue).
2007-01-12 20:56:59 · answer #7 · answered by girlonline64 5 · 0⤊ 0⤋
They can still carry the blue eyes allele but not display it because they are carrying a more dominant allele ie brown eyes.
2007-01-12 20:57:28 · answer #8 · answered by Anonymous · 0⤊ 0⤋
well, my three children all have colored eyes and my husband a I have brown eyes. My husbands are more hazel. But both of our grand parents have blue eyes.
2007-01-12 21:01:07 · answer #9 · answered by Lola C 1 · 0⤊ 0⤋
brown eyes are dominant, but it doesnt mean there isnt a chance of you having blue eyes.
2007-01-12 20:56:09 · answer #10 · answered by Me of course 2 · 1⤊ 0⤋