Which one of the following is a physical factor that induce mutation?
Acridines
$HNO_{2}$
$UV-$rays
Base analogue
$UV$-rays and Non-ionised radiation
The Barr body is observed in
Which pair of chromosomes is concerned with Down's syndrome
Albinism is a congenital disorder resulting from the lack of the enzyme
Knowing that albinism is determined by a recessive gene in man; presence of albinism in children born to a couple proves that
Foetal sex can be determined by examining cells from amniotic fluid looking for
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