Light micrograph of Feulgen-stained metaphase I of meiosis in anther of Luzula echinata. Two bivalents (arrows) show orientation on the metaphase plate that will result in an equational first division followed by a reductional second division. The other four bivalents will follow the "typical" sequence of a reductional first division followed by an equational second division.

References

Braselton, J. P. 1981. The ultrastructure of meiotic kinetochores of Luzula. Chromosoma 82: 143-151.

Braselton, J. P. 1997. Microscopic procedures for plant meiosis. The American Biology Teacher 59: 502-506.