Genetic diversity among plantagos. XII, An aneuploid of Plantago lagopus L. for a telocentric microchromosome

In the progeny of a cross between di- and trisomic plants of Plantago lagopus, one offspring had the full complement of 12 and a small additional chromosome. The latter is distinct on account of its very small size and terminal centromere. To distinguish it from rest it has been called microchromosome. It shows affinity with one of the two nucleolar chromosomes of the standard complement and keeps attached to the nucleolus during prophase. The microchromosome gets transmitted through male as well as female sex tracks. In the progeny raised by selfing the m plus plants, a few offsprings with two m chromosomes have been recovered.