$A$ normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?
$25\;\%$
$50\;\%$
$100\;\%$
$75\;\%$
A person with blood group$-A$ has
Preformation theory concerning transmission of characters was given by
Haemophilia is caused due to lack of
An albino lady marries a normal man having one gene for albinism. They have $3$ daughters and $1$ son. The son will be
A person is suffering from disease phenylketonuria, which is an autosomal recessive disease. Which of these is lacking in the person?