Conventional giemsa and C-banded karyotypes of XXXX and S. rodhaini.

@entity383 @entity380 @entity616
The karyotypes of a Puerto Rican strain of @entity380 and a Kenyan strain of S. rodhaini are similar in number of general morphology. For each species there are eight pairs of chromosomes (2n =16) which are divided into three size groups. C-banded methods revealed, in addition to centromeric heterochromatin, a large @entity616 in one for the No. 2 chromosomes in females but not in the other. Neither No. 2 chromosome of males possessed the @entity616 . This pair (2) is interpreted as the sex chromosomes, with the female being heterogametic (ZW), the male homogametic (ZZ). Differences between karyotypes of the two species occurred. These included a satellite on the No. 3 chromosome of @entity383 and a euchromatic tip on the otherwise heterochromatic short arm of the W chromosome of this species; neither of these was present in S. rodhaini. The two species also differed in that the centromeric index of the Z of @entity383 was smaller than that of the W, whereas in S rodhaini the reverse was true. In @entity383 the large @entity616 of the W chromosome was identified in prophase and interphase nuclei as well as at metaphase.
