It is true. The "bad" allele is on his X chromosome, which he donates. (Of course, for her to be colorblind, her mother must also donate a "bad" allele. So the mother must either be colorblind or be a carrier.)
As colour blindness is sex linked and recessive the father may not have been colour blind but may have been a carrier, the mother must also have been a carrier.Colour blindness in females is rather rare but if you inherit 2 carrier genes the girl would be homozygous recessive and therefore be colour blind.
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It is true. The "bad" allele is on his X chromosome, which he donates. (Of course, for her to be colorblind, her mother must also donate a "bad" allele. So the mother must either be colorblind or be a carrier.)
As colour blindness is sex linked and recessive the father may not have been colour blind but may have been a carrier, the mother must also have been a carrier.Colour blindness in females is rather rare but if you inherit 2 carrier genes the girl would be homozygous recessive and therefore be colour blind.
Hope that helps