Evolution__3rd_Edition

Plate 8
Chromosomal races of the house mouse (Mus musculus) in Maderia. Circles and squares represent samples, and the different
symbols represent different chromosome forms. Rb stands for Robertsonian fusion, which is the fusion between two chromosomes
that (before fusion) had centromeres at their ends. The numbers in parentheses are the two chromosomes that fused. Diploid
numbers (2N) and sample sizes (n) are as follow: red dot, 2N = 22, n = 43; red rectangle, 2N = 23–24, n = 5; red star, 2N = 24–40,
n = 38; yellow dot, 2N = 28–30, n = 5; blue dot, 2N = 25–27, n = 10; white dot, 2N = 24–26, n = 11; green dot, 2N = 24–27, n = 25;
black dot, 2N = 24, n = 6. (See Section 13.4.2, p. 361.) Reprinted, by permission of the publisher, from Britton-Davidian et al. (2000).