• (A) the gene for colour-blindness inherited from mother is dominant over the normal gene from father
• (B) the colour-blindness gene is a recessive gene borne on the X chromosome and the sons inherit it only from mother but daughters inherit it both from father as well as mother
• (C) the female hormone in girls does not allow the expression of the colour-blindness gene in daughters.
• (D) the gene for colour-blindness is recessive gene inherited by sons only from mother and the daughters inherit it only from father.