Karyotype of the egg chromosomes of an orb weaving spider, Neoscona nautica (C.L. Koch) (Araneae: Araneidae)

Date

6-1994

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

ABSTRACT

REMIL HERNANDEZ GARCIA. University of the Philippines at Los Banos. May 1994. Karyotype of the Egg Chromosomes of an Orb-weaving Spider, Neoscona nautica (C.L. Koch) (Araneae: Araneidae). Adviser: Dr. Adelina A. Barrion The egg chromosome technique employed to the orb-weaver, Neoscona nautica (C.L. Koch) revealed distinct qualitative and quantitative karyomorphological features. Round interphase nuclei of N. nautica measured 0.4 to 15.6 micrometers (u) in diameter. Oval to round nuclei were present in prophase cells but majority were ov,a1 with dimensions ranging from 10.0 to 27.6 micrometers. The different stages of mitosis, namely: Prophase, Metaphase, Anaphase and Telophase were identified and characterized. Mitosis in N. nautica was normal and regular. The chromosome number of N. nautica was 2n=22 . Prophase was the most frequently encountered stage, while cells at Metaphase were the least encountered. Mean mitotic index was 47.947 Chromosomes were all monocentric and classified as median submedian. Relative mean length of the chromosomes rang. from 0.025 to 0.077.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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