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.
Tay-Sachs is an autosomal recessive genetic disorder. Autosomal means it affects males and females equally and recessive means both parents must be a carrier for the children to be at risk. If both parents are carriers, there is a 25% chance with each pregnancy that the child will be affected.