Screwdrivers are distinguished from each other based on their tip and what type of screw they drive. The two most common screwdriver tips are 1) the slot head screwdriver, and 2) the Phillips-head screwdriver.
Globalization broadly refers to the expansion of global linkages, the organization of social life on a global scale, and the growth of a global consciousness, hence to the consolidation of world society. Such an ecumenical definition captures much of what the term commonly means, but its meaning is disputed.
In population genetics, linkage disequilibrium is the non-random association of alleles at different loci. Loci are said to be in linkage disequilibrium when the frequency of association of their different alleles is higher or lower than what would be expected if the loci were independent and associated randomly.