Mongolism syndrome is caused by
One extra chromosome
One extra sex chromosome
One extra chromosome in 21st pair
One less sex chromosome
Drosophila has four pairs of chromosomes. How many linkage groups does it have
All the sons are haemophilic and daughter are normal of a haemophilic father and normal mother. This character is
To be evolutionary successful, a mutation must be
Example of environmental determination of sex is/are
Incomplete dominance is shown by