: 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.
A calendar quarter refers to blocks of three months spread out over the calendar year. The first calendar quarter begins January 1 and ends March 31, the second calendar quarter begins April 1 and ends June 30, the third calendar quarter begins July 1 and ends September 30, and the fourth calendar quarter begins October 1 and ends December 31.