Female heterogamety and extraordinary low chromosome number in Rana paramacrodon (Amphibia: Ranidae)

Main Article Content

Yong H. S.
Ng K. L.

Abstract

The karyotypes of a male and two female specimens ofRanaparamacrodon from Singapore were examined. The diploid number of 2N=20 is the lowest known for the genus Rana. All the ch-romosomes were biarmed. The female frog was heterogametic (with ZW sex chromosomes), while the male was homogametic (ZZ). Autosome pair no. 1 was distinctly longer than the rest. The smallest autosome pair was also distinctive in size, morphology and the presence of a secondary constriction on the long arm.
ABSTRAK Kariotip Rana paramacrodon telah dikaji atas seekor katak jantan dan dua ekor katak betina dari Singapura. Nombor diploid dengan 2N=20 adalah yang paling rendah bagi genus Rana. Setiap kromosom mempunyai dua lengan. Katak betina adalah heterogametik (dengan kromosom seks ZW), manakala katak jantan adalah homogametik (ZZ). Panjang pasangan autosom no. 1 berbeza dengan nyatanyadaripadakromosom-kromosom yang lain. Pasangan autosom terkecil adalah juga distinktif dalam saiz, morfologi dan kewujudan cerutan sekunder pada lengan panjang.
(karyotype, female heterogamety, Rana paramacrodon, Amphibia, Anura)

Downloads

Download data is not yet available.

Article Details

How to Cite
H. S., Y., & K. L., N. (1994). Female heterogamety and extraordinary low chromosome number in Rana paramacrodon (Amphibia: Ranidae). Malaysian Journal of Science, 15(1&2), 1–2. Retrieved from https://ejournal.um.edu.my/index.php/MJS/article/view/4439
Section
Original Articles