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Recurrent selection. II. An experimental study with mice and Drosophila

Recurrent selection. II. An experimental study with mice and Drosophila

Genetical Res 3(3): 333-351

Report of a study of recurrent selection to an inbred tester. A suitable inbred line was used as a tester parent, and selection made within a non-inbred population on the individuals crossing performance with the tester line. It is concluded that there are two situations in which recurrent selection could be profitably applied: (1) recurrent selection should be successful when applied to characters closely related to fitness which have little additive genetic variance and (2) in cases where a character has already been subjected to individual or family selection and has reached a plateau level in that population. The two experiments - i. e. recurrent selection for large litter size in mice and for low bristle number in Drosophila melanogaster - reported here are respectively examples of the above situations. In each experiment selection was made between males within the closed non-inbred population on the basis of the performance of their test-cross progeny resulting from matings from inbred line females. Initial generation hybrid performance in both experiments was not intermediate between parental performance levels and the divergence from intermediacy was away from the direction of selection. In both experiments there was no evidence to suspect the presence of over-dominance. Response to selection was obtained in each experiment but this was close to or less than the expected response calculated on the assumption that all the variance between sires in crossing performance was additive genetic variance. From these experiments it is not possible to draw any firm conclusions about the effectiveness of recurrent selection for exploiting overdominance. It is, however, a very inefficient way of exploiting additive genetic variance. It is suggested that more success might be obtained by careful choice of base population material used in recurrent selection.

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Accession: 014163611

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DOI: 10.1017/S0016672300003190

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