B-chromosome Effects at Meiosis in Crepis capillaris

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Abstract
Analysis of chromosome behavior at meiosis in C. capillaris, 2n = 2x = 6 + B-chromosomes, shows that the B-chromosomes influence the frequency and distribution of chiasmata in the A-chromosomes. The mean chiasma frequency of the A''s is increased by the presence of 1-4 B''s, so too is the variance of the chiasma frequency mean between the pollen mother cells within plants. The A-chromosome bivalents differ in length, but all have similar mean chiasma frequencies, and they are all influenced to the same extent. Some data are also presented on the meiotic behavior of the B-chromosomes themselves. Many of them are eliminated as micronuclei.