Abstract
The break-points for an interchange in rye are such that all three combinations, the normal structural homozygote, the interchange heterozygote and homozygote were readily identifiable at both mitosis and meiosis. Most of the interchange homozygotes are inviable. In populations subjected to increasing selection pressures imposed by high sowing density the proportion of interchange heterozygotes among survivors increased. In terms of survival (seed to adult viability) the interchange heterozygotes at high sowing densities have a 102 per cent advantage over the normal homozygotes, more than sufficient to generate a stable polymorphism for the interchange. The general requirements for the maintenance of interchange are considered and analysed in relation to the degree of heterozygote advantage, the effects of the structural change upon fertility and to the breeding systems of natural populations.
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