: 11 The later definition by Cavalli-Sforza & Bodmer (1971) is currently used: Genetic polymorphism is the occurrence in the same population of two or more alleles at one locus, each with appreciable frequency, where the minimum frequency is typically taken as 1%.
The financial world splits up its calendar into four quarters, each three months long. If January to March is the first quarter, April to June is the second quarter, and so on, though a company's first quarter does not have to begin in January.
Basically, the person who earns a consistent wage in each quarter in the base period is awarded more weeks of unemployment. A person who has periods in the base period where they did not work as much, or earned much more than the other quarters will have their number of weeks reduced because of the ratio formula.