THE MATURATION DIVISIONS AND SEGREGATION OF HETEROMORPHIC HOMOLOGOUS CHROMOSOMES IN ACRIDIDAE (ORTHOPTERA)

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Abstract
Segregation of unequal homologous chromosomes in Trimerotropis citrina, Mecostethus gracilis and Amphitornus bicolor occurs in both maturation divisions. An aberrant first spermatocyte division in A. bicolor and an unusual octad in T. citrina both result in unusual distributions of chromatids which would give unexpected ratios in genetical work. Chromomere vesicles are considered as a possible mechanism for change in size of chromosomes and adaptive hereditary changes. The paper contains also a criticism of the treatment of maturation in current text-books of Zoology.