Which of the following diseases results from the genetic inability to synthesize a single enzyme?
Colour blindness
Down's syndrome
Phenylketonuria
Crossing over
Fruit colour in squash is an example of
The most common type of haemophilia results from the congenital absence of
Chromosomes that determine male sex in Melandrium plant is
When an albino female plant of maizeis crossed with normal green male plant, all plants in the progeny are albino because
Which one of the following is a dominant trait