is it possable for two brown eyed people to have a blu eyed child?

Question

what are the odds

Answer 1

It only depends on whether the people in question have BOTH a recessive gene for blue eyes. There is NO other way. As it is not a sex linked trait both can carry the gene without actually expressing it.

Take for example the punnett square:
Take capital B for brown, small for blue

Mother Father
Bb x Bb

Cross the mothers big B with the fathers big B, the mothers big B with the fathers small b, the mothers small b with the fathers big B and finally the mothers small b with the fathers small b to give:

BB,Bb,Bb,bb - genotypes

Phenotypes:
So its a one in four the child will have blue eyes. 50% chance they will carry the recessive gene and 25% they will be homozygous dominant.

Answer 2

About 1 in 5

Answer 3

Eye color determination is much more complicated than doing a simple two-gene Punnett square. I can't remember exactly how many genes it is, but I'll say it's three for this example. This goes into quantitative inheritance, where there is a whole range of possibilities for one trait that might not be identical to that of either parent. Think of it like height- you could be anywhere within a range of heights based on which tall genes you got from your parents.

You could have two light brown-eyed parents and get any eye color from a lighter blue to very dark brown. The child can't have super light blue but could have a darker blue. Going back to the height thing, that's the best way I can explain it. If heights if a four gene trait and I got three tall genes, I will be x inches taller than my pre-determined base height. My dad had blue eyes and my mom has very dark eyes so I proably got more dark genes from my mom and less from my dad to get light brown.

Answer 4

It's possible assuming both parents carry the gene for blue eyes. Brown eyes are dominant, so it's possible that they both carry the gene without having blue eyes. In that case, you have a one-in-four chance of a blue-eyed offspring.

However, if even one parent carries 2 brown eye genes, then they will definately pass on the dominant brown-eye gene to all offspring. In this case, ALL offspring will be brown-eyed, regardless of any other factors.

Answer 5

Yes it is possible assuming they both carry the recessive blue-eye gene.

Look up a Punnet square

A= dominant
a= recessive

Aa = the genotype of each parent

.....A a
A AA Aa
a Aa aa

The odds are one in four that the child will have blue eyes. They would receive the recessive aa genotype.

Answer 6

Yeah. If the parents have a dominant and recessive gene combined in their gene, then they could have a blue eye child. but the ratio would be 1:4

Answer 7

Yes possible...there is no way of telling the odds unless we know the exact genotype and genes the parents carry.

Answer 8

yes

There's no way of telling the odds, unless you track the grandparents and greatgrand...

Depending on the paternal and maternal unseen genotypes, you're looking at a range between 0-25%

Answer 9

it all depends if they are both brown eyed they have the dominant brown allelle for that eye colour it all depends if they have a recessive allelle for blue eyes if you needa nymore information read up on genetics and genetic crosses

Answer 10

I don't know the odds, but yes it's possible...genetic material comes from his and her side plus parents, grandparents, etc.