Factors affecting the meiotic pairing behaviour of B chromosomes in the grasshopper Eyprepocnemis plorans

Publisher Website
Google Scholar
Abstract
A study of the meiotic behavior of different B-chromosome variants in E. plorans demonstrates that pairing and chiasma formation in these supernumerary chromosomes depend both on genotypic factors and on the structure of the B chromosomes themselves. Genotypic effects are evidenced by the differences in chiasma frequency which the same B-chromosome combinations show in different individuals. Structural effects can be inferred from the fact that 9 of the 14 known B variants carry a unique site to which interstitial chiasmata are confined; such a site is lacking in the other 5 variants.