The Genomic Structure of Arabidopsis thaliana

See background information about the structure of chromosomes. The genome of Arabidopsis thaliana consists of 5 chromosomes, one circular mitochondrial DNA, and a circular chloroplast DNA. Chromosomes are often drawn as in Figure 1 below: with a short and long arm and an intervening centromeric region. Figure 2 depicts the shapes and relative sizes of the Athaliana chromosomes. Table 1 shows the size (in Mbp) and predicted number of genes for each chromosome.

Figure 1

Figure 2

Table 1

Chromosome

Size
(Mb)
Predicted Genes

Chr1

30.4

7863

Chr2

19.7

5115

Chr3

23.5

6255

Chr4

18.6

4811

Chr5

27.0

7084

Mitochondria

0.366

135

Chloroplast

0.154

122

Total

~120Mb

31,385