Abstract
In inbred lines of rye (Secale cereale L.) a close negative correlation was found between mean chiasma number and their between-cell variance. No correlation was detected between mean chiasma number or chiasma variance and the positional distribution of chiasmata within the bivalents, that is, terminal or interstitial. It is concluded, therefore, that while the between-cell variance of chiasmata is a direct consequence of the mean chiasma frequency, the positional distribution of chiasmata within bivalents is probably subject to an independent control system.
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