Abstract
1. The frequency and behaviour of chiasmata is quantitatively analysed in Spironema fragrans from early diakinesis to metaphase for different kinds of bivalents whose somatic chromosome morphology is known.2. The behaviour of chiasmata is followed throughout successive stages in the two arms of one kind of bivalent.3. There is no change in the mean number of chiasmata in the different bivalents from diakinesis to metaphase. Terminalisation is incomplete.4. The frequency variation of chiasmata in the different bivalents shows the presence of interference.5. The relation between chromosome length and the mean number of chiasmata per bivalent is very closely directly proportional.6. Terminalisation proceeds at a different rate in the different kinds of bivalents.7. The number of terminal chiasmata is increasingly greater in bivalents with, 1, 2, 3, and 4 chiasmata in each dass of bivalent.
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