Wilson detected the colour blindness disease in

$A$ color-blind woman marries a man with normal vision. In their offspring,.........

Mr. Stevan is suffering from haemophilia and cystic fibrosis. His father is heterozygous for cystic fibrosis. The probability of Stevan's sperm having recessive $X$-linked as well as autosomal allele is

Polydactyly in humans is caused by a/an:

Persons who are colour blind cannot distinguish between which of the following colours?

Select the incorrect match regarding the symbols used in Pedigree analysis: