Education - Chromosomes - Characteristics
Rice chromosomes are extremely small. Compared with the chromosomes of barley which belongs to the same Family Gramineae, rice chromosomes are approximately one-fifth to one-tenth of barley chromosomes (Fig. 2). Recent studies revealed that the rice genome consisted of 430 Mb while the amount of DNA of barley genome was as eight times large as the rice genome, making clear the correlation between the amount of DNA and the size of chromosomes.
Figure 2. Barley (left) and rice (right) chromosomes at the metaphase of somatic division. (at the same magnification)
Figure 3. The nuclei at the prometaphase (a) and the late prophase of somatic division. Figure 3b is the nucleus used for the construction of Figure 1b (2n=24+1).
Figure 4. (a) Pachytene nuclei and (b) the late pachytene bivalents during the prophase at the first division of meiosis.