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Unformatted text preview: s, M. acuminata and M. balbisiana. Common cultivated bananas are usually triploid (3n) with three sets of chromosomes. Close­up view of fleshy, berrylike banana fruits. The small Close­up view of fleshy, berrylike banana fruits. The small black dots inside are the remnants of aborted ovules that did not mature into seeds. Since this fruit develops on a sterile plant without fertilization it is termed parthenocarpic. The genes of sterile transgenic crops, such as The genes of sterile transgenic crops, such as bananas, are not as likely to escape into the environment through seeds or pollen. Because edible bananas do not produce seeds, new groves are planted from cuttings of existing stock; however, this asexual propagation also spreads diseases and pests, such as the black sigatoka fungus, nematodes and weevils. Modern tissue culture methods will allow existing strains to be reared in a disease­free environment resulting in clean planting stock. Genes from other banana strains can also be inserted into existing s...
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