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Expression of Genetic Traits among PTC Tasters and Non Tasters in Mysore Population, South India

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Author(s): SUTTUR. S. MALINI | KAVITHA P | VINEETH V S | CHAITRA P T | SREENIVASA G | MOHSEN NAJAFI

Journal: International Journal of Biological Sciences and Engineering
ISSN 0976-1519

Volume: 01;
Issue: 04;
Start page: 216;
Date: 2010;
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Keywords: dominant | recessive | co-dominant trait | PTC tasters | PTC non tasters

ABSTRACT
The ability to taste phenylthiocarbamide (PTC), a bitter chemical has long been known to be a heritable trait, which is being widely used for both genetic and anthropological studies. This study is the first attempt to examine the association of tasters and non-tasters of phenylthiocarbamide (PTC) and its relation to expression of dominant, recessive and co-dominant genetic traits in Mysore, South India. The present investigation was conducted in Mysore, South India during the year 2009 - 2010. A total of 1152 healthy volunteers with an age range of 20 to 22 years were considered for the present study. Phenylthiocarbamide taste sensitivity was measured by administering a serial dilution of a freshly prepared phenylthiocarbamide solution, following the modified method of Harris and Kalmus. Genetic registry was used to collect information about family history, medical history, information about life style factors and diet. Dominant and recessive genetic traits are recorded with the help of questionnaire specially designed for this study. In the general population PTC tasters are significantly more frequent (61.63%) than non tasters (38.37%). Significant differences exist between tasters and non tasters with reference to blood group B which is a co-dominant trait but remaining blood groups show no significant differences. Few of recessive traits go along with non taster’s trait. The percentage of non tasters trait is evidently low in general population due to key role of natural selection

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