The Effect of Selection on the Fertility of Translocation Heterozygotes in the House Fly

Abstract
A line of house flies carrying an autosomal translocation was maintained through 10 generations by mating translocation heterozygote males to non-translocated females, these 2 genotypes being recognized by marker genes. Selection was applied for enhanced egg hatchability and as a result, the mean increased by about 10%, but a plateau was reached beyond which there was no further response to selection. It is inferred that part of the response to selection was due to evolution of a small degree of non-random chromosome co-orientation in the translocation heterozygotes. The significance of such evolution to the use of translocations for pest control is discussed.

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