Question

Colour blind daughter is born to a

• A. Colour blind mother and a normal father
• B. Carrier mother and a colour blind father
• C. Normal mother and a colour blind father
• D. Carrier mother and a normal father

Answer 1

Answer: (B)

Carrier mother and a colour blind father

Color blindness is the inability or decreased the ability to see colour or perceive color differences, under normal lighting conditions. Colour blindness affects a significant percentage of the population. There is no actual blindness but there is a deficiency of color vision. The most usual cause is a fault in the development of one or more sets of retinal cones that perceive color in light and transmit that information to the optic nerve. This type of color blindness is usually a sex-linked condition. The genes that produce photopigments are carried on the X chromosome. If some of these genes are missing or damaged, color blindness will be expressed in males with a higher probability than in females because males only have one X chromosome, whereas females have two and a functional gene on only one of the X chromosomes is sufficient to yield the necessary photopigments. So, colour blind daughter is born to a carrier mother and a colour blind father. Thus, option B is correct and other options are wrong.