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What are the chances of children inheriting color-blindness from a mother who carries it and a father who is not color blind??

2007-02-05 07:24:35 · 5 answers · asked by Jazmine B 1 in Education & Reference Homework Help

5 answers

There is some information missing. But looking at the questions you can assume that:
1) it's about red-green color blindness, which is a sex linked trait
2) the mother herself is not colorblind, just a carrier

This results in a father with normal X and a Y (because he is a man) and the mother having a normal X and a "carrier" Xd.

Now if it's a daughter it can not inherit color blindness, because her father always passes on a normal X (chance 0%).

If it's a boy, he gets the Y from his father and either a colorblind Xd or a normal X (chance 50%).

And if we take this together and say its a 50% chance to either give birth to a boy or a girl, we get an overall 25% chance of having a colorblind child.

2007-02-05 23:14:29 · answer #1 · answered by Colblindor 2 · 0 0

I think it is always inherited through the fathers Genes. So I think you are fairly safe .But as with all things in nature you can't always tell,they can do blood tests on children to find out. If you are concerned for your future children then it is hard to be sure.

2007-02-05 15:33:41 · answer #2 · answered by Lindsay Jane 6 · 0 0

Depends on the type of color blindness.

Dichromacy is a moderately severe color vision defect in which one of the three basic color mechanisms is absent or not functioning. It is hereditary and sex-linked, affecting predominantly males.

* Anomalous trichromacy is a common type of congenital color vision deficiency caused by the reduced amount (not absence) of one of three cone photopigment types.[6] Anomalous trichromacy occurs when one of the three cone pigments is altered in its spectral sensitivity, but trichromacy or normal three-dimensional color vision is not fully impaired.[5]

* Protanomaly is a mild color vision defect in which a deficiency of red retinal receptors results in poor red-green hue discrimination. It is congenital, sex-linked, and present in 1% of all males.[6]
* Deuteranomaly is the most common type of color vision deficiency, mildly affecting red-green hue discrimination in 5% of all males. It is hereditary and sex-linked.[6]

The gene for red-green color blindness is transmitted from a color blind male to all his daughters who are heterozygote carriers and are perceptually unaffected. In turn, a carrier woman passes on a mutated X chromosome region to only half her male offspring. The sons of an affected male will not inherit the trait, since they receive his Y chromosome and not his (defective) X chromosome.

2007-02-05 15:40:24 · answer #3 · answered by lou53053 5 · 0 0

If the child is a girl then the girl will most likely not get it, but if the child is boy then he will be more likely to get it.

2007-02-05 15:31:56 · answer #4 · answered by love_alw_693 3 · 0 0

zero percent. color-blindness is a recessive trait.

2007-02-05 15:29:25 · answer #5 · answered by anqi_yu 3 · 0 1

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