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Red/green colour blindness
I heard that it can only be passed from the mother to her child not the father, however I then heard that a father who is r/g colour blind will pass it to all his daughters but no sons. Is any of this true?
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The recessive gene for Red/Green colour blindness is carried on the X chromosome, so yes, the mother can be a carrier, but usually women don't have the colourblindness symptoms because they have two X chromosomes. Males have XY chromosome pairing, which makes colour blindness more common in men than in women.
A father who is colourblind will pass the recessive gene to all his daughters, but unless the mother also carries a colour blindness gene, the daughters will not be colourblind. However, they will carry the gene, and if they had any male offspring, then there is a high probability that their sons would be colourblind.
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