Abstract
Genetic sexing can be defined as the use of genetic mechanisms to produce unisexual male progenies for release in an insect control programme. The advantages of an all male release can include economic savings and better biological efficiency of the released males. Various genetic mechanisms have been investigated to accomplish this end, the most successful being the use of chromosomal translocations.
Translocations involve the exchange of genetic material between two different chromosomes and a special type of translocation i.e. male-linked translocation will be defined and their characteristics as relevant to genetic sexing will be described. Translocations are often associated with reduced fertility which can be a disadvantage. The fundamental principle exploited in the use of translocations is the creation of a new male-linked genetic entity.
The gene systems used in combination with the translocations can be roughly divided into lethal and visible mutant types. The lethal system includes for example insecticide resistance/susceptibility genes and the visible systems can be characterized by pupal colour mutants. By combining the translocation with the gene system it is possible to link a particular gene with the male sex.
The developments of genetic sexing systems in C. capitata will be briefly reviewed. The systems include pupal colour, sensitivity to ethanol and purine. Data is presented on the induction and recovery of translocations and the stability of the translocation complexes.
The paper will conclude with a discussion on the practical application of genetic sexing systems in mass rearing facilities and the difficulties which are likely to be experienced. It is concluded that integration of such systems into a sterile insect release programme would greatly increase the economic feasibility and lead to a more widespread acceptance for this type of insect control.
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Robinson, A.S. (1986). Genetic Sexing and Translocations in Ceratitis Capitata . In: Mangel, M., Carey, J.R., Plant, R.E. (eds) Pest Control: Operations and Systems Analysis in Fruit Fly Management. NATO ASI Series, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70883-1_15
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DOI: https://doi.org/10.1007/978-3-642-70883-1_15
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