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| Modern Genetic Analysis Chapter 5. Recombination of Genes Linkage Maps Figure 5-15. Mapping the chromosomes of tomatoes. (a) Photomicrograph of a meiotic prophase I (pachytene) from anthers, showing the 12 pairs of chromosomes as they appear under the micro-scope. (b) The currently used chromosome numbering system, using both numerals and letters. The centromeres are orange, and the flanking, densely staining regions (heterochromatin) are shown in green. (c) (facing page) A linkage map made in 1952 showing the linkage groupings known at the time. Each locus is flanked by drawings of the variant phenotype that first identified that genetic locus (to the right or above) and the appropriate normal phenotype (to the left or below). Interlocus map distances are shown in map units. (Parts a and b from C. M. Rick, "The Tomato," Scientific American, 1978; part c from L. A. Butler.)

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