If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is
$0$
$0.5$
$0.75$
$1$
The pedigree chart given below shows a particular trait which is absent in parents but present in the next generation irrespective of sexes. Draw your conclusion on the basis of the pedigree.
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 ?
Give scientific reasons : The Mendelian experiments cannot be carried out in human beings.
If a colour blind woman marries a normal visioned man, their sons will be
Given below is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes $a$ and $b$ could be of