Mucus Plug, SICK

2 dominants don't create a recessive... each person carries 2 genes.

It can be a combination of 2 dominants, 2 recessives, or a dominant and a recessive. You only pass on one of those genes to your child... one from each parent. So, if the child gets a recessive and a dominant gene... the the child has the dominant characteristic, but still carries the recessive one...

hence why blue eyes can "skip a generation", and why 2 brown eyed parents can have a blue eyed child... but 2 blue eyed parents cannot have a brown-eyed child.

It's sad because I would love to have at least one brown-eyed baby...

Genetics are so interesting but so confusing! I hope this baby has green eyes like mine, Keith has blue like Dh. I had a dream last night that she had white blonde hair like Keith and all her facial features looked just like him! Then later on in my dream she had brown hair.

2 dominants don't create a recessive... each person carries 2 genes.

It can be a combination of 2 dominants, 2 recessives, or a dominant and a recessive. You only pass on one of those genes to your child... one from each parent. So, if the child gets a recessive and a dominant gene... the the child has the dominant characteristic, but still carries the recessive one...

hence why blue eyes can "skip a generation", and why 2 brown eyed parents can have a blue eyed child... but 2 blue eyed parents cannot have a brown-eyed child.

I guess I worded it wrong. What I was getting at was that I thought it was more uncommon for the recessive color to come out of two dominants???? Ok, I'm still wording this wrong and can't articulate what I'm trying to say through typing I guess!

Anyhow, yes- genetics are certainly interesting!!

And Jess, hope that little baby is still staying put!

2 dominants don't create a recessive... each person carries 2 genes.

It can be a combination of 2 dominants, 2 recessives, or a dominant and a recessive. You only pass on one of those genes to your child... one from each parent. So, if the child gets a recessive and a dominant gene... the the child has the dominant characteristic, but still carries the recessive one...

hence why blue eyes can "skip a generation", and why 2 brown eyed parents can have a blue eyed child... but 2 blue eyed parents cannot have a brown-eyed child.

I guess I worded it wrong. What I was getting at was that I thought it was more uncommon for the recessive color to come out of two dominants???? Ok, I'm still wording this wrong and can't articulate what I'm trying to say through typing I guess!

Anyhow, yes- genetics are certainly interesting!!

And Jess, hope that little baby is still staying put!

no it's pretty much 50-50% each way.

The combinations are - here's a scenario:

D - dominant (brown)
R - recessive (blue)

*********
Parent A Parent B Parent C Parent D

DD RR DR DR

All children of parents AB will have eyes that are DR, so Brown and carry the blue gene.

Let's say... AB1, AB2, and AB3, they'll have 3 kids.

Children of parents C&D could be:

DD (25% chance) (child CD1)
DR or RD (50% chance) (child CD2)
RR (25% chance) (child CD3)

*******

If child AB1 grown up and marries...say... CD1, then it becomes

Parent AB1 Parent CD1
DR DD

their children wil be:

DD, DD, RD, RD. In all cases, there is a D gene... so all their children will have brown eyes. 50% chance to carry the blue gene, so 50% chance that the child's child will have blue eyes depending on the genetic makeup of their partner.

********

If child AB1 has children with CD2, then it is

Parent AB1 Parents CD2
DR DR (or RD, it's the same)

The kids will be:
DD, DR, RD, RR - so there is a 25% chance each child may have blue eyes, a 75% chance to carry the blue gene - which means that their children later may have blue eyes...if their partner also carries it.

*********

and lastly if AB1 has children with CD3

Parent AB1 Parent CD3
DR RR

the kids will be:

DR, DR, RR, RR... so a 50% chance the child will have brown, 50% chance the child will have blue, but 100% to carry the gene and either 50% or 100% possibly pass it on, again depending on their partner's genes.


I remember in biotechnology we had to do the scenarios for about 7 generations. Ugh. It was fun though, I loved it.

If you had a recessive gene to brown, you'd have brown eyes... because the brown gene isn't recessive, it's dominant. You can't carry the brown gene and not have brown eyes. So there's NO WAY the baby can have brown eyes.

However, green and hazel are both recessive... so you can carry those and still have blue eyes.

Same with blond... blond is recessive, brown is dominant. Since you both have blond hair, both genes you each carry have to be non-brown... so maybe like dirty blond and blond is what you're carrying? You child will definitely be blonde... just how blond, I can't say.

No, no, you're still wrong.

Most ppl are still used to that high school punnet square type of thing, and dont realize that scientists figured out it doesnt quite work like that.

Again, its rare, but absolutely can happen.

>>Most of us learned the model for determining eye color that G.C. Davenport and C.B. Davenport devised in 1907. The Davenport model wrongly says brown eye color is always dominant over blue eye color, which means that two blue-eyed parents always have blue-eyed kids. We know better now.

"Although not common, two blue-eyed parents can produce children with brown eyes," says Richard A. Sturm, a Principal Research Fellow at the Institute for Molecular Bioscience at the University of Queensland in Brisbane, Australia.

Eye color is a complex trait that depends on the state of several interacting genes. The gene that usually decides the issue (blue eyes or brown eyes) is the OCA2 gene on chromosome 15. But it comes in different strengths. A person with a weak form of the OCA2 gene will have blue eyes. Likewise a person with a strong form will have brown eyes.

The plot thickens, though, because an individual also has other eye-color genes that each has a say in the final eye-color outcome. For example, if one of these lesser genes is strong, it can make the weak form (blue) of OCA2 work much more effectively — almost like the strong form (brown). Then the eye color may be a light brown or muddy grey. In fact, the resulting color can be any shade of brown, hazel/green, or blue depending on the strengths of the interactions.

If you had a recessive gene to brown, you'd have brown eyes... because the brown gene isn't recessive, it's dominant. You can't carry the brown gene and not have brown eyes. So there's NO WAY the baby can have brown eyes.

However, green and hazel are both recessive... so you can carry those and still have blue eyes.

Same with blond... blond is recessive, brown is dominant. Since you both have blond hair, both genes you each carry have to be non-brown... so maybe like dirty blond and blond is what you're carrying? You child will definitely be blonde... just how blond, I can't say.

No, no, you're still wrong.

Most ppl are still used to that high school punnet square type of thing, and dont realize that scientists figured out it doesnt quite work like that.

Again, its rare, but absolutely can happen.

>>Most of us learned the model for determining eye color that G.C. Davenport and C.B. Davenport devised in 1907. The Davenport model wrongly says brown eye color is always dominant over blue eye color, which means that two blue-eyed parents always have blue-eyed kids. We know better now.

"Although not common, two blue-eyed parents can produce children with brown eyes," says Richard A. Sturm, a Principal Research Fellow at the Institute for Molecular Bioscience at the University of Queensland in Brisbane, Australia.

Eye color is a complex trait that depends on the state of several interacting genes. The gene that usually decides the issue (blue eyes or brown eyes) is the OCA2 gene on chromosome 15. But it comes in different strengths. A person with a weak form of the OCA2 gene will have blue eyes. Likewise a person with a strong form will have brown eyes.

The plot thickens, though, because an individual also has other eye-color genes that each has a say in the final eye-color outcome. For example, if one of these lesser genes is strong, it can make the weak form (blue) of OCA2 work much more effectively — almost like the strong form (brown). Then the eye color may be a light brown or muddy grey. In fact, the resulting color can be any shade of brown, hazel/green, or blue depending on the strengths of the interactions.