Question

When a normal male and a female infected with colour blindness married, the appearance of this case will be in
all males
all females
50% of males
50% of females

Answer 1

When a normal male (XY) and a female carrier of color blindness (X^cX) marry, their offspring have the following probability for color blindness:

50% of sons (XY) will inherit the color blindness allele and be affected.
50% of daughters (X^cX) will inherit the color blindness allele from their mother and be carriers of the gene.

So, in this scenario, the appearance of color blindness would be in 50% of the sons.