The lengths of four hetermorphic chromosomes in ten cells(μm).

The ten cells are respectively from ten individuals (5♀, 5♂) with karyotype IV from different populations. The T test is made between the sum of the length of the four heteromorphic chromosomes from chromosome no. 1 and no. 6 designed as (1−1)+(1−2)+(1−1)+(1−2) and the sum of the length of the two normal homologues designed as [(1−1)+(6−1)]×2, p>0.05. “1−1” and “1−2” refer to the length of two homologues of chromosome no. 1, respectively. “6−1” and “6−2” represent the length of two homologues of chromosome no.6, respectively.