How can 2 brown eyed people have a blue eyed kid, one blue & green eyed have blue eyed, & the blue+blue=green?

Question

So we have:
Brown eyes+Brown eyes=Blue
Blue+Green=Blue

And the two blue ones
Blue+Blue=Green?

How is that possible with only one green eyed grandparent?
Does anyone on here know the answer to that other than me?

Answer 1

Blue, always predominates. So. brown on brown should produce brown, unless there's a genetic throwback. Blue plus anything else = Blue.

Answer 2

Eye colour is, apparently, the result of at least two separate genes, both or either of which can be recessive (no melanin) or dominant. Blue eyes are recessive, so both parents need to contribute two recessive genes each. Green eyes have some melanin (which is brown - and yellowish when there is not a lot) which may be a result of one recessive and one dominant gene - since blue and yellow make green.

For two coloured eyed parents, the likelihood of a blue eyed child is 1 in 4, not 1 in 2, therefore.

There is, apparently, more to it than that, even, since a lot of children are born before the eye colouring develops (hence blue but changing colour in a week or so). Also, people's eye colour may change as they get older and some claim to have different colouring according to the weather or their emotions (that I find hard to believe, though).

Answer 3

That's pretty common. Brown eyes are dominant, so you have the capability of having children with any color eyes. I think it's impossible for two blue-eyed people to have a brown-eyed child, because blue is recessive.

Answer 4

We all have the same set of genes in our dna. However we may have different levels.

We say a gene is dominate due to statistical analysis of various colors of eyes.
For Brown + Brown eyes, suppose statistics indicate:
Brown 75%
Green 10%
Blue 11%
Yellow 1%
White !%
Red 2%

Therefore there are possibilities for each.

Answer 5

one or both parent is heterozygous which means they have (b=blue B=brown)different traits. B is dominate. A punnit square would show this

parent b B
b bb Bb
b bb Bb
It means that 1 parent has different traits. Combine the top and bottom parent traits to get the combination. there is a 50% chance brown and 50% chance blue

Answer 6

blue eyes are a recessive genetic trait. two brown eyed parents can have a blue eyed child if there was one blue eyed grandparent. it simply happens, there is no mathmatical formula for it.

Answer 7

Yes Dr. Mendel. You can also cross a wrinkled yellow pea with a smooth green pea and get a wrinkled green pea 33% of the time! It's genetics.

Answer 8

It is a bit obvious that 2 black people cannot have a green or blue kids you fecking eejit!

Answer 9

1. Forget everything you obviously think you know about genetics.

2. Ask your biology teacher to explain the rest because I can't be arsed.

Answer 10

Recessive genes.