in the x direction, the water wants to flow in that direction) For a given hydraulic. conductivity, the vertical flow rate depends on the sum of the gravitational potential energy. gradient per unit weight of water (dz/dz =1) and the vertical gradient in soil water pressure.
Origin and spread of the 1278insTATC mutation causing TayâSachs disease in Ashkenazi Jews: Genetic drift as a robust and parsimonious hypothesis. Human Genetics 114 (4): 366â376. pmid 14727180.
Answers. Best Answer: Tay-Sachs disease (TSD) is a genetic (and fatal) lipid storage disorder caused by insufficient activity of an enzyme called beta-hexosaminidase A that catalyzes the biodegradation of gangliosides (fatty substances).ere are two locations for the HEXA gene. Cytogenetic Location: 15q23-q24 (The HEXA gene is located on the long (q) arm of chromosome 15 between positions 23 and 24. Each chromosome is divided into two sections called 'arms'.