Colour blindness query

kingfisherblue

My biological father was colour blind. I was adopted by my stepdad many years ago, and didn't know about the colour blindness until I found out that my younger son is colourblind. I am obviously a carrier.


So, my question. My daughter is due to give birth to a boy. Is it possible that he might be colour blind? I assume that I could have passed on the relevant 'gene' to my daughter, and therefore she might be a carrier. Or am I wrong, and it's not possible for me to pass it on to my daughter?

sheramber

http://www.colourblindawareness.org/colour-blindness/inherited-colour-vision-deficiency/

kingfisherblue

Thanks Sheramber. I've already read that, but to be honest, I'm no clearer. I don't know whether it's because I'm tired, or whether it's because I'm not very good at science. I think it means that I may have passed the 'gene' to my daughter, and she may be a carrier, but I'm not certain.

Sorry to be so dim

onomatopoeia99

You didn't pass on the gene, you don't have it, you are not a carrier. If you had the gene to pass on, you would be colour blind.



The mother of your son passed on the gene to him, she is the carrier. If not colour blind herself, there is a 50% chance she will also have passed it on to your daughter and your daughter is also a carrier.. If your daughter is a carrier, then there is a 50% chance of male children being colour blind. If she isn't a carrier, and the baby's father isn't colour blind, then there's no chance. Assuming in the preceding that the father of this child is not colour blind.



So if the father is not colour blind, there is a 25% chance that the son will be with the information you have provided.

kingfisherblue

onomatopoeia99 wrote: »

You didn't pass on the gene, you don't have it, you are not a carrier. If you had the gene to pass on, you would be colour blind.



The mother of your son passed on the gene to him, she is the carrier. If not colour blind herself, there is a 50% chance she will also have passed it on to your daughter and your daughter is also a carrier.. If your daughter is a carrier, then there is a 50% chance of male children being colour blind. If she isn't a carrier, and the baby's father isn't colour blind, then there's no chance. Assuming in the preceding that the father of this child is not colour blind.



So if the father is not colour blind, there is a 25% chance that the son will be with the information you have provided.

I am the mother. I am not colourblind, neither is my son-in-law.


Thank you for explaining.

oystercatcher

I think kingfisherblue is female in which case she is a carrier of colour blindness but doesn't have the condition because she has one 'good' gene.

There is a 50% chance of the daughter being a carrier if she is a carrier her son(s) will be colourblind and daughters will have a 50% chance of being carriers (assuming non carrier father of child)

there is a 50% chance daughter is not carrier and then all children will be unaffected (assuming non carrier father of child)

onomatopoeia99

kingfisherblue wrote: »

I am the mother.

Ah, then I would have written the explanation differently. I had a 50/50 chance of guessing right and I guessed wrong.

kingfisherblue

oystercatcher wrote: »

I think kingfisherblue is female in which case she is a carrier of colour blindness but doesn't have the condition because she has one 'good' gene.

There is a 50% chance of the daughter being a carrier if she is a carrier her son(s) will be colourblind and daughters will have a 50% chance of being carriers (assuming non carrier father of child)

there is a 50% chance daughter is not carrier and then all children will be unaffected (assuming non carrier father of child)

Yes, I'm female


One of my son's is quite severely colourblind, and my other son is unaffected. I wasn't sure whether I could have passed the gene to my daughter, and her son possibly being born with colour blindness (most things on the internet mention your children, but not grandchildren). I thought that I probably could have passed on the gene, but I wasn't entirely clear. You have explained it well, thank you.



My mum didn't realise that I could be a carrier for colour blindness, so it was quite a surprise to find that my younger son had the condition - he was about eight or nine before we found out. I was interested to see if my daughter could be a carrier. My son-in-law is not colourblind, so it's entirely on our side of the family.


Thanks everyone for your help

Artytarty

This is interesting to me too.
May I ask, now the Kingfisherblue has her answer, how it might work out in my family please?
I'm female, no colour blindness on my or my husbands sides.
My daughters husband is colourblind.
How are their children, if any, likely to be affected?

silvercar

I'm female and partially colour blind, I have particular problem with maroon- rust area of the spectrum, but can easily distinguish red and green.

Both my sons are partially colour blind but in different areas. One struggles with blue - green range and the other dark reds.

bouicca21

My ex is colour blind. My understanding is that my daughters are carriers but that a son would have been ok.