Mendelian disorder may be of

Study the pedigree chart given below. What does it show?

Recessive characters are expressed

A normal­visioned man whose father was colour­ blind, marries a woman whose father was also colour­blind. They have their first child as a daughter. What are the chances that this child would be colour­ blind ?

In a sickle cell anaemia glutamic acid is replaced by valine, which the following codes for glutamic acid ?