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 ?
$1$
Zero percent
$0.25$
$0.5$
One of the genes present exclusively on the $X$-chromosome in humans is concerned with
Which one of the following symbols represents mating between relatives in human pedigree analysis?
Most studies on human genetics have been made through
Which of the following is not true of haemophilia?
Recessive characters are expressed