$21$ trisomy in humans causes
Klinefelter's syndrome
Down's syndrome
Turner's syndrome
Patau's syndrome
Which of the following is not a hereditary disease
Mongolism syndrome is caused by
The hybrids are generally found to be superior to their parents, it is because of
Which of the following trait shows transmission from carrier female to male progeny?
Polytene chromosomes in salivary glands of are formed as a result of