K10L2 pairs more consistently with N10 than with Ab10. Plants heterozygous for different forms of chromosome 10 were assayed at the pachytene substage of meiosis I. Ab10-I paired well with Ab10-II (in 6 of 10 cells assayed, as depicted), and K10L2 paired well with N10 (in 10 of 10 cells, as depicted). In contrast, K10L2 did not pair in an orderly way with either Ab10-I or Ab10-I-Df(B) (each pairing looked different; the ones depicted are examples). TR-1 repeats are shown in red, 180-bp repeats in green, and centromeres in yellow. Boxed areas are enlarged below, and illustrated with cartoons to show the inferred pairing arrangements.