Question

Red-green colourblindness is a sex linked trait.Which of the given statement is not correct regarding colourblindness.
A. It is more common in males than in females.
B. Homozygous recessive condition is required for the expression of color blindness in females.
C. Males can be carriers of the trait.
D. Colour blind female always have colourblind father and colourblind son.

Answer 1

Hint: Color blindness is a hereditary disorder caused by a variation in the reaction to certain colours of one or more of the light-sensitive cells located in the retina of the eye. These cells, called cones, detect light wavelengths and make it possible for the retina to discern colours from each other. This difference in sensitivity can render a person colour blind in one or more cones.

Complete Answer:
- Red-green colorblindness is a type of colorblindness in which it is viewed as similar to red and green. This is the type of colorblindness that is most common. In an X-linked recessive way, it is inherited and affects 6 percent of males. It is often referred to as color blindness of Deutan, deuteranopia, and Daltonism. In certain situations, red-green colour blindness is caused by a faulty X-chromosome.
- Human beings have 23 distinct pairs of chromosomes, of which the so-called sex-chromosome is one pair. This pair consists of two female X-chromosomes and one male X-chromosome, paired with one male Y-chromosome.
- In the red-green region, colour vision is encoded on the X chromosome, which is considered a sex-related trait.This concludes that a man will suffer from colour blindness if he is a carrier of a defective X-chromosome.
- The non-defective gene is in control of women and is thus not colorblind, but a carrier for colour blindness. This symptom is called X-linked recessive, because a woman needs two defective X-chromosomes to be affected. You can not inherit it from him if you are male and your father suffers from a red-green colour vision deficiency. Only women who pass it on to their sons may be carriers of colour blindness.

The correct answer is option(C) Males can be carriers of traits.

Note: There is a 50 percent probability that the gene is borne by daughters and can be passed on to the next generation. There is a 50 percent probability that the gene will not be carried by a daughter and will, thus, not be passed on. There is a 50% probability that children do not have the gene and will be healthy. There is a 50% probability, however, that a son will have inherited the gene and will express the characteristic or condition.