: 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.
Many companies define their fiscal quarters as 13-week periods rather than three calendar months.2 A 52-week fiscal year omits one day a year (two days in a leap year) requiring an extra week to be added to one fiscal quarter (the â14-weekâ quarter) every five or six years.