còn thông tin về rice
"However, there is no direct linear relationship between units of genetic distances in centimorgan (cM) and physical distances in kilobase pairs (kb). [Note that 1
megabase pair (Mb) = 103 kilobase pair (kb) = 106 bp]. For chromosome 4 of Arabidopsis, for example, the kilobase pair to centimorgan ratio varied from 30 to 550 kb per cM (Schmidt et al., 1995). In rice 1 cM on average equals to
258.5 kb (The Rice Genome Sequencing Project, 2005) but this figure actually varies from
120 to 1000 kb gene-rich regions to
22,000 kb for gene-poor regions (Gill et al., 1996a). Physical distribution of recombination events is non random in other plant species as well (Rick, 1971). Division of higher organism genomes into gene-rich and gene-poor compartments seems a common feature (Sumner et al., 1993). Regions corresponding to centromeres (Figure 9), and even some telomeres in tomato and potato, show a 10-fold decrease in recombination
compared to other regions in the genome (Tanksley et al., 1992).
Nguồn
http://ajol.info/index.php/ajb/article/viewFile/56082/44537
Review
Principles, requirements and prospects of genetic mapping in plants
African Journal of Biotechnology Vol. 5 (25), pp. 2569-2587, 29 December 2006