What is pedigree analysis? Suggest how such an analysis, can be useful.

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind ?

The most striking example of point mutation is found in a disease called