Tests for variation in PTC taste perception, and defective colour vision we
re performed on Paidies, an endogamous Scheduled Caste population of Vizian
agaram district of Andhra Pradesh. The frequency of non-taster gene (t) amo
ng paidies is 0.5588 and low frequency of colour blindness (0.025) was obse
rved. The results are compared with those of other Andhra populations.