Abstract
The meiotic analysis in ten varieties of Lathyrus sativus clearly indicated that there was a regular formation of seven bivalents in all of them. However, they differed appreciably from each other in the number of ring and rod bivalents per pollen mother cell and the value of half chiasma per bivalent. The study of intraclass variance showed a significant variation in the chiasma frequency of different varieties. A negative correlation was noted in all the varieties except KH4 which registered a positive correlation. Such observation was indicative of the fact that there existed a variation in the distribution of chiasmata even in the same pollen mother cell. Pollen sterility was present in all the varieties but it had not attained considerable value.The meiotic data obtained from ten varieties of Lathyrus sativus confirmed that karyotype asymmetry and change in the morphology of the chromosomes were instrumental in speciation within this plant.
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