Karyotype of the egg chromosomes of an orb weaving spider argiope shillogensis sinha (Araneae : argiopidae).

Date

3-1994

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Eggs masses collected from reared Argiope shillongensis Sinha which were fixed in Carnoy's solution and stained with lactoacetoorcein revealed distinct karyotypic features. Somatic chromosome number of shillongensis Sinha was in 24. Chromosomes were all monocentric and classified as median, submedian and subterminal. Relative lengths of chromosomes ranged from 0.04 to 0.143. Divisions of mitotic egg chromosomes were regular and normal . The mean mitotic index was 85.6%. Interphase cells contained round nuclei which ranged from 14.12 to 21.10 microns in diameter. Oval to round nuclei were present in prophase cells but majority were ova with dimensions ranging from 21.77 to 35.30 microns. At metaphase, the chromosomes aligned themselves at the equatorial region. Disjunction of the chromatids occurred at anaphase and assembled themselves at polar ends of the cell at telophase.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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