Explanation:
Haemophilia is an X-linked recessive disorder. It is caused due to the deficiency of clotting factors VIII or IX. The gene that codes for these clotting factors is located on the X chromosome. Hence, the inheritance of haemophilia follows the pattern of X-linked recessive inheritance.

Mode of inheritance:
The mode of inheritance of haemophilia is X-linked recessive inheritance. This means that the gene mutation responsible for haemophilia is located on the X chromosome. Since males have one X chromosome and one Y chromosome, they only inherit one copy of the gene mutation. Therefore, if a male inherits the gene mutation from his mother, he will develop haemophilia. On the other hand, females have two copies of the X chromosome. If one X chromosome has the gene mutation, the other X chromosome can compensate for it. Therefore, females are usually carriers of the gene mutation and do not develop haemophilia.

Comparison with other disorders:
Myopia, skin colour and night blindness are not inherited in an X-linked recessive manner. Myopia is a polygenic disorder, which means that it is caused by multiple genes. Skin colour is also a polygenic trait, and it is also influenced by environmental factors such as exposure to sunlight. Night blindness can be caused by various factors such as vitamin A deficiency, retinal disorders, or genetic mutations. However, these mutations are not inherited in an X-linked recessive manner.

Conclusion:
In conclusion, the mode of inheritance of haemophilia is X-linked recessive inheritance. This means that the gene mutation responsible for haemophilia is located on the X chromosome and is inherited in a specific manner. It is important to understand the mode of inheritance of genetic disorders to predict the likelihood of passing on the gene mutation to future generations.

It is colourblind ness because both haemophilia and colourblindness are X-LINKED RECESSIVE DISORDERS.They follow X-LINKED RECESSIVE INHERITANCE.