: 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 quarter is a financial trading period in business. There are four quaters in a financial year so there are four quaters in a year. Depending on the company a quarter may start at any time. Though for ease many start in January others in April the beginning of the tax year.