Cytological and cytogenetic studies on the transposition of centromere and the karyotype differentiation in haplopappus gracilis. I. A new-shaped chromosome.

1. In the inbred line of Haplopappus gracilis KH-1 (2n=4), a new-shaped chromosome was found. The length of this chromosome was similar to chromosome 1 and this is J-shaped chromosome having centromere at the subterminal position.2. From the distribution of the early condensing regions at mitotic prophase and the meiotic chromosome behaviour of the heterozygotes of J-shaped and V-shaped chromosome…