C. F. Curtis
Articles written in Journal of Genetics
Volume 61 Issue 3 December 1974 pp 205-217
As part of a study on the suitability of translocations for insect pest control, artificial selection was applied for either higher or lower egg hatchability in each of the reciprocal matings between a translocation heterozygote and a translocation homozygote. In each of four selection lines, there was response to selection but, after 3–4 generations, limits were reached beyond which further selection gave no response. On reversing the directions of selection, the high and low lines rapidly exchanged their levels of egg hatchability and then established new plateaux. Relaxation of selection caused convergence towards the original unselected level. It is concluded that individuals with extremely high or low fertility were disfavoured by natural selection. Populations initiated from two different translocation homozygotes formed a stable polymorphism and after propagation in bottles for 10 generations, small increases were found in the fertility of the double translocation heterozygotes compared with the same genotype newly produced from unselected homozygote stocks. It is concluded that, under the conditions of the bottle cultures, natural selection favoured increase in fertility of the double heterozygotes.
Volume 62 Issue 2 December 1975 pp 53-60
A reciprocal translocation between chromosome 2 and 3, designated T2, was viable when homozygous in the ROCK strain of
Volume 62 Issue 3 June 1976 pp 101-115
Cycling populations of
Volume 63 Issue 1 April 1977 pp 31-37
Previously reported effects of aging and mating history in causing partial loss of cytoplasmic incompatibility in males of Paris cytoplasmic type, have been shown also to occur in males with Delhi and Hamburg cytoplasmic types. It was unexpectedly found that increasing the ratio of females to males at the first mating did not lead to enhancement of the level of partial compatibility when the males were re-mated. The effect of aging is discussed in relation to the use of cytoplasmic incompatibility integrated with chromosomal abnormalities, for genetic control.
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