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allotetraploid
Значение термина allotetraploid в knolik
allotetraploid - allotetraploid (AMPHIDIPLOID)
allotetraploid - Allopolyploid which arises when an ordinary hybrid between two different species, containing a set of chromosomes from each parent, doubles its chromosome number. An ordinary hybrid is usually sterile because its chromosomes cannot pair during meiosis. But if it becomes an allo-tetraploid it solves this difficulty because each chromosome then has a homologue with which it can pair. An entirely new species is thus immediately created. Tobacco probably originated in this way. Since interspecific hybridization and successful polyploidy is rarer in animals than in plants, allotetraploidy is known at present only in plants. Artificial preparation of allotetraploids has great scope in the production of new agricultural and horticultural varieties. Doubling of the chromosome number can be achieved in several ways, particularly by colchicine.
Рядом со словом allotetraploid в knolik
| allosterig | В начало буква "" буквосочетание "" | als |
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