This the type of variation which shows clear-cut and sharp differences amongst organisms over a given trait. In discontinuous variation differences do not merge into each other and there fore there are no intermediate grades.
Features can not be measured but can be observed and there fore we can not obtain a normal distribution curve.
Features persist through out the life time of an organism. They show distinct differences. Eg sex, finger print, tongue rollers and non tongue roller, colour blindness, taster and non tasters to PTC (phenyl thio carbamide) blood groups, sickle cell anaemia, haemophilia, skin pigmentation (normal skin colour/albinism) eye colour etc. They are not affected by environmental condition.