I. A. Zakharov1, G. D. D. Hurst2, N. E. Chernysheva1, and M. E. N. Majerus2
1 Vavilov Institute
of General Genetics, Russian Academy of Sciences, Moscow, 117809 Russia
2 University of Cambridge, Cambridge, CB2 3EH United
Kingdom
Received January 16, 1996
Abstract—Secondary sex ratio
is female biased (72 females : 34 males) in the St. Petersburg population of
Adalia bipunctata. Approximately 50% of females produced unisexual
progeny lacking males. This trait was
maternally inherited for five
generations in progeny of such females. The male-killing factor can be
eliminated
by treatment with tetracycline, i.e., it represents a bacterium
that transmits transovarially. In contrast to the
male-killing agent from
British and Netherland populations, this bacterium does not belong to the genus
Rick-
ettsia, as was demonstrated by polymerase chain reaction (PCR)
with specific primers.
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