evolutionary history of Drosophila buzzatii. XXIV. Second chromosome inversions have different average effects on thorax length

We demonstrate a genetic correlation between rearrangements of the second chromosome of D. buzzatii and thorax length, as a measure of body size. The results indicate that 2j and 2jz(3) arrangements are correlated with large size, whereas 2st arrangement is correlated with small size. Some inversion...

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Bibliographic Details
Published in:Heredity 1992-06, Vol.68 (6), p.557-563
Main Authors: Hasson, E, Fanara, J.J, Rodriguez, C, Vilardi, J.C, Reig, O.A, Fontdevila, A
Format: Article
Language:English
Subjects:
Animals
Biological Evolution
Biomedical and Life Sciences
Biomedicine
body length
body size
Chromosome Inversion
chromosome polymorphism
chromosome rearrangement
chromosomes
Cytogenetics
dominance
Drosophila
Drosophila - genetics
Drosophila - growth & development
Drosophila buzzatii
Ecology
evolution
Evolutionary Biology
Female
genetic correlation
Genetic Variation - genetics
Human Genetics
inversion
karyotyping
length
life cycle (organisms)
Male
Mathematics
natural selection
original-article
Plant Genetics and Genomics
Selection, Genetic
thorax
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Summary:We demonstrate a genetic correlation between rearrangements of the second chromosome of D. buzzatii and thorax length, as a measure of body size. The results indicate that 2j and 2jz(3) arrangements are correlated with large size, whereas 2st arrangement is correlated with small size. Some inversions (2st and 2jz(3)) show dominant effects and others (2j/jz(3)) exhibit overdominance. These results show that at least 25 per cent of body size variation may be accounted for by the studied karyotypes. The possible integration of the genotypic, phenotypic and fitness levels, and also the possible implications to life-history evolution theories, are discussed. These results suggest that, under moderate to high heritability values, some kinds of chromosomal endocyclic and/or balancing selection may be valuable mechanisms for maintenance of body size variation.
ISSN:0018-067X
1365-2540
DOI:10.1038/hdy.1992.78