Spermatogenetic cells and chromosomes of the Mirid bug, Cyrtorhinus lividipennis reuter (Hemiptera : Miridae)

Date

3-1988

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

Cellular and chromosomal features of spermatogenetic cells of C. lividipennis were observed cytologically using the lacto-aceto orcein squash technique. It was determined during diakinesis and pachvtene stages that the haploid chromosome number of C. lividipennis was n = 11(10II + X0). The diploid chromosome number, therefore, is 2n = 21. The X0-sex determining mechanism was easily identified due to its heterochromaticity, peculiar isolating behavior during metaphase 1, and lagging behavior during anaphase T. Although majority of the cells observed during diakinesis had normal chromosomal number, few cells were determined to have less chromosome counts caused by the fusions of chromosomes. The relative lengths of their autosomal chromosomes as shown by idogram and karyogram ranged from 0.060 to 0.142 and 0.080 to 0.130 respectively. More dividing cells (89.74%) were observed than non-dividing cells (10.90%) and the high mean meiotic index (90%) suggests the possibility of producing high frequency of spermatozone.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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