Meiosis in the Hybrid Between Beta vulgaris and Beta webbiana

Abstract

1. Paired as well as unpaired chromosomes were observed in pachytene.
2. Eighteen univalents are present at diakinesis; sometimes however, two univalents lying above one another give the impression of a bivalent.
3. Some of the univalents undergo fragmentation at diakinesis.
4. Meiosis II may fail to occur; dyads then form after the first division.
5. Irregularities in meiosis lead to the formation of supernumerary micro spores.