Karyotypes of the egg chromosomes of wolf spider Hippasa holmerae Thorell (Araneae: Lycosidae sundevall).

Date

3-1999

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Egg masses of the wolf spider Hippasa hohnerae Thorell were collected, fixed with Carnoy's solution and stained with lacto-aceto-orcein. Distinct features of the different stages of mitosis were observed and noted. Chromosome number of wolf spider H. hohnerae Thorell was 2n= 26. Nuclear shape and dimensional changes were observed at the Interphase and Prophase stages wherein the nuclei were spheroidal and oval respectively. Mean mitotic index was 76.69% and the most frequently encountered stage was Prophase while having Telophase the least observed. Karyotype analysis showed that chromosomal average relative lengths ranged from 0.033 to 0.109. Based on the positioning of the centromeres, the chromosomes of H. hohnerae were classified into three types: median, submedian and subterminal. Arm ratio was 0.200 - 0 926 and centromeric index was 16.67 - 42.86. Mitotic stages were normal except for occasional asynchronous behavior of few chromosomes during Anaphase.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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