Question

A sex linked trait/ disease is?
(A) Colour blindness/ haemophilia
(B) Night blindness/ albinism
(C) Myxoedema/beri-beri
(D) Deafness/ tylosis

Answer 1

Sex linked is a trait in which a gene is located on a sex chromosome.In humans, the term generally refers to traits that are influenced by genes on the X chromosome

Complete answer:
Colour blindness is a sex-linked disease which is genetically transmitted.As compared to the females, the red-green colorblindness is influenced more in males for the reason that the genes necessary for the red and green colour receptors are situated over the X chromosome, only one presented in males, whereas the females have two.The females (XX) are affected by colour blindness barely if both their X chromosomes are flawed with an identical deficiency, while males (XY) are affected by colour blindness if their sole X chromosome gets faulty.On the other hand, haemophilia is a type of genetic disorder which is associated with recessive X chromosomes.This results in a deficiency of active clotting factors.Such deficiencies are found more frequently in males as compared to the females.In case of albinism, the pattern of inheritance is found to be variable.Oculocutaneous albinism is an autosomal recessive disease, while the ocular albinism is transmitted as a sex-linked disease.Moreover, the person suffering from night blindness loses the ability to see properly at night or at low vision.

In this disease, the men are more affected than the women.Tylosis is an uncommon autosomal dominant disease which is caused due to mutations in tylosis with esophageal cancer.Deafness could occur as an inherited state in a new-born baby.

Hence, the correct answer is option ‘A’.

Note: It is to consider that, as the females consists of two copies of X chromosome and the males consists of only one X chromosome, therefore the X chromosome-linked recessive diseases or disorders are frequently found in males.