| cytogenetic studies of hynobiidae (urodela)xviii. a zz/zw sex-determining mechanism in a hynobiid salamander species, hynobius tokyoensis tago. | the karyotype of hynobius tokyoensis (2n = 56) was analyzed using three kinds of banding methods to determine the morphological differentiation of the sex chromosomes of this species. salamanders and egg sacs were collected from seven localities around tokyo, japan. of 28 chromosome pairs, microchromosome no. 21 was identified as a zz/zw-type sex chromosome. the z chromosome was acrocentric, whereas the w chromosome was submetacentric, with a heterochromatic, elongated short arm. interestingly, ... | 2002 | 12900564 |