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Genetic evidence of an unorthodox chromosomal system in the lac insect Kerria lacca (Kerr)

Published online by Cambridge University Press:  14 April 2009

N. S. Chauhan
N. S. Chauhan
Affiliation:
Indian Lac Research Institute, Namkum, Ranchi, Bihar, India

Summary

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The colour difference (crimson and yellow) in Kerria lacca (Kerr) was used to test the ‘Lecanoid’ system of chromosome behaviour proposed on cytological evidence. The colour strains bred true for colour. Reciprocal matings between the colour strains produced only crimson sons and daughters, confirming that the colour difference is not sex-linked and that the male is somatically a diploid. The phenotypes of the F2 and the backcross generations differed according to the heterozygosity and the direction of cross of the F1 parents, since heterozygous females produced two kinds of gamete but heterozygous males produced only the maternal kind. Thus, while elimination of the paternal gene and hence chromosome was confirmed during the formation of male sex-cells, demonstration of somatic diploidy of the male is not compatible with a ‘Lecanoid’ system in K. lacca. Instead, the available cytogenetic evidence is suggestive of a chromosome system with heterochromatization and elimination of the paternal chromosome-set confined to the male germ line.

Type
Short Papers
Information
Genetics Research , Volume 16 , Issue 3 , December 1970 , pp. 341 - 344
Copyright
Copyright © Cambridge University Press 1970

References

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