TABLE 2

Estimated divergence times, numbers of chromosomal rearrangements, and rates of chromosomal evolution for various taxa

TaxaDivergence time (millions of years)No. of rearrangementsRatea
H. annuus-H. petiolaris 0.75–1115.5–7.3
B. rapa-B. oleracea 152.5
A. thaliana-B. nigra 35901.3
Homo-Mus1141440.6
Gossypium spp.1090.5
Sus-Mus114770.3
Sorghum-Zea24150.3
B. nigra-B. oleracea 20120.3
Oryza-Zea66350.3
B. nigra-B. rapa 20100.3
Lycopersicon-Solanum1050.3
Homo-Sus93350.2
Lycopersicon-Capsicum40140.2

Helianthus data are from this study. All other divergence times and numbers of rearrangements are from Lagercrantz (1998).

  • a Rate was calculated as (number of rearrangements)/(2 × divergence time) because rearrangements can accrue on the branch leading to either of the two taxa.