title: Studies on the ability to taste phenylthiocarbamide; red-green colour blindness and the age at menarche in Johannesburg Chinese school children.
abstract: The sample, although small, represents the total number of children attending the Johannesburg Chinese Kuo Ting Primary and High School in 1972 to 1974. The frequency of the non-taster gene was found to be 0,167 in the combined male and female sample. The gene for red-green colour blindness is present in the Johannesburg Chinese population but at low frequnecy, 0,012. The mean age at menarche was found to be 12,8+/-1,23 years and is younger than the mean ages recorded for a number of Caucasoid populations. It is suggested that this difference in mean age reflects possibly varying genetic rather than varying socio-economic factors.
mesh_terms: D000293:Adolescent; D000328:Adult; D044466:Asian People; D002648:Child; D002675:Child, Preschool; D002681:China / Q000208:ethnology; D003117:Color Vision Defects / Q000453:epidemiology*; D005260:Female; D005787:Gene Frequency; D006801:Humans; D008297:Male; D008572:Menarche; D010670:Phenylthiourea; D013019:South Africa; D013649:Taste
chemical_list: D010670:Phenylthiourea