Rit Landbúnaðardeildar : B-flokkur - 01.05.1947, Page 9

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Figs. 1—6. Meiosis in Cakile edentula. — Fig. 1. Metaphase—I in side view, drawn
separately. — Fig. 2. Five quadrivalents from one cell, drawn separately. — Fig. 3.
A metaphase—I plate in polar view, 2 quadrivalents + 14 bivalents. — Fig. 4. Meta-
phase—II plates, 18:18 chromosomes. — Fig. 5. Metaphase—II plates, 17:19 chromo-
somes.. — Fig. 6. An inversion bridge with a fragment.
2% of the cells studied. The average frequency of quadrivalents per cell
is M ± m = 3.56 ± 0.01. On the basis of the relatively high frequency of
quadrivalents at meiosis it might be assumed that the species Cakile
edentula should be regarded as an autotetraploid species.