Cytology and karyomorphology of the egg chromosomes of an orb weaving spider, Cyrtophora exanthematica (Doleschall) (Araneae: Araneldae).

Date

3-1995

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

The egg chromosome technique employed to the orb- weaver, _Cyrtophora exanthematica Doleschail) revealed distinct qualitative and quantitative cytological and karyontorphological features. Round interphase nuclei of C. exanthematica (Doleschall), ranged from 7.50 to 11.25 it In diameter. Oval to round nuclei were present in Prophase cells but majority were round with dimension ranging from 15 to 30 p . The different stages of mitosis, namely Prophase, Metaphase, Anaphase and Telophase were identified and characterized. Mitosis in C. exanthematica (Doles-chaff) was normal and regular. The chromosomes number of the egg cells at diploid of C. exanthematica (Doleschall) was 2n=22 (20 A -I XX female and XY male). Prophase was the most frequently encountered stage. While cells at Anaphase were the least encountered. Mean mitotic index was 62.15%.The chromosomes were all monocentric and classified as median and submedlan. Relative mean length of the chromosome ranged from 0.025to 0.061.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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