Table 1.

Rates of Chromosomal Evolution and Hsa1 Fragmentation

Species	Haploid no.	CSUs relative to the placental ancestora	No. rearrangements relative to ancestral genomeb	Genomic rateb	No. of Hsa1 fragments
dolphin	22	25	3	0.034	1
cat	20	27	6	0.068	2
human	23	29	6	0.068	1
macaque	21	28	7	0.080	1
mink	15	26	10	0.114	2
lemur	30	35	10	0.114	3
tree shrwe	31	35	10	0.114	2
horse	32	40	15	0.170	3
cow	30	41	16	0.182	3
bat	16	35	19	0.216	3
shrew	10	30	20	0.227	2
pig	19	41	22	0.250	6
gibbon	22	51	26	0.295	4
spider monkey	17	48	30	0.341	6
dog	39	64	39	0.443	7

^aY chromosome excluded in counts. Data are from O'Brien et al. (1999b), Wienberg et al. (2000), Murphy et al. (2001c), Yang et al. (2000)

^bSee Methods for description of calculation