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Journal of Heredity Advance Access originally published online on May 13, 2008
Journal of Heredity 2008 99(5):539-545; doi:10.1093/jhered/esn026
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Effect of Mutations on Developmental Stability and Canalization in Morphological Traits in Drosophila ananassae

C. Vishalakshi, and Bashisth N. Singh

From the Genetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi 221 005, India

Address correspondence to B. N. Singh at the address above, or e-mail: bnsingh{at}bhu.ac.in.

The present study was designed to determine the effects of visible mutations of large effect on developmental stability and canalization in different morphological traits, namely, sternopleural bristle number, wing length, wing to thorax ratio, ovariole number, and sex comb tooth number (SCTN) in Drosophila ananassae. We have compared the mean trait size, fluctuating asymmetry (FA) (as an index of developmental stability), and morphological variation (as an index of canalization) of different mutant strains (yellow body color, y; claret eye color, ca; plexus wing, px; spread wing, spr; ebony body and sepia eye color, e se; yellow body and claret eye color, y ca; and cardinal eye color, curled wing, and ebony body color, cd cu e) with wild-type strain. The mean trait size of all morphological traits differs significantly among the wild-type and mutant strains. The wild-type and mutant strains vary significantly for the morphological variation and also for the levels of the FA in different morphological traits. However, we have found no increase in either the variance or in the degree of FA with the increase of the mutations (except in SCTN in y mutant). The plausible reasons for the variation in wild-type and mutant strains with particular reference to developmental stability and canalization have been discussed.

Corresponding Editor: Ross Maclntyre

Received August 7, 2007
Accepted March 10, 2008


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