Which one of the following is a physical factor that induce mutation?
Acridines
$HNO_{2}$
$UV-$rays
Base analogue
Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?
Which of the following diseases results from the genetic inability to synthesize a single enzyme?
A cross involving two different genera is called
The common point of attachment of all the arms of polytene chromosome, is known as
Preformation theory concerning transmission of characters was given by