What Are The Odds Of My Daughter's Son Being Colour-Blind

[Spanishfly]

I have pprobably known more colour-blind people than most would expect to meet in a lifetime: my maternal grandfather was colour-blind, as is my elder brother, the only one of my parents' five male offspring to be affected. My husband was also colour-blind, as is the elder of his two brothers. Neither of my two children has manifested the gene, but now my daughter is expecting a son, and I'm curious as to his chances of inheriting it - not worried, mind, just curious.

[New Judge]

Colour-blindness is almost an entirely inherited condition and males are about twelve times more likely to inherit it than females (all to do with chromosomes and genes).

[JimF]

They can't cure it yet, but there are amazing glasses which can allow colour-blind people to distinguish colours.

https://www.youtube.com/results?search_query=seeing+colours+for+the+first+time

[Buenchico]

See the table here:
http://www.colourblindawareness.org/colour-blindness/inherited-colour-vision-deficiency/

[Maydup]

A man is colour blind and has all daughters, none of who are colour blind, yet their sons are colour blind.

[Peter Pedant]

one half
the chance is that child will be colour blind is 1/2

standard assumptions - that the colour blindness is red green and that there is no new mutation

wading thro the script - the grandfather of the new baby is colour-blind. Then all his daughters are obligate carriers.
grandad is X(c) Y and all the daughters have to take on the X(c) colour blind gene and chromosome from their father and get the other X gene from their mums in order to be gurlz (XX)

The daughter is now gonna have a son ( the propositus)
His makeup is gonna be XY - the Y from the dad ( think about it) and the X from the mum where there is a choice of two = X and X(c)

so one half will be X(c) Y and will be colour blind sons
and one half will be the other X XY - not colour blind and not carrying it

I thenk yew

The incidence is 8% and doesnt die out in families as far as I know or any loss is balanced by new mutation so the rate stays the same.
and this must mean that there is an evolutionary advantage to being co;our blind in our society

You can see froo camouflage they say - and so colour blind hunters are more successul .... that is what some people say

[cassa333]

I have a friend who only sees in black and white.

[ummmm]

All 3 of my kids have problems with their eyes, inherited from me, and I was told the chances of passing it on is 50/50. Only one of my boys is colour blind. It's quite mild though...mainly pale colours.

[Jonathan-Joe]

Peter - You have overlooked the colour blindness on SpanishFly's side of the family. There is a 50% chance that she is a carrier. Adding this to your analysis, there is a 75% chance of the grandson being colour blind. Of course, the two sides of the family may have different forms which could affect the analysis.