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三、非整倍体及其在遗传育种中的应用单体和缺体单体2n—1和缺体2n—2一般在二倍体中罕见,因为 n—1配子一般不能正常发育。但在异源多倍体中可能存在。因为它们的配子中不只一个基本染色体组,所缺染色体的功能可由亲缘关系较近的染色体组中类似染色体所补偿。如在普通小麦 AABBDD六组染色体中,ABD 具有类似的性质,因此可以形成一整套(21个)单体和缺体。小麦的各个单体和缺体都有形态上的变异,如单体9,表现斯卑尔脱小麦的性状:护颖
Third, aneuploidy and its application in genetics and breeding Monomers and missing monomers 2n-1 and missing 2n-2 are generally rare in diploid, because n-1 gametes generally can not normally develop. But may exist in allopolyplasia. Because they have more than one basic set of chromosomes in their gametes, the function of the missing chromosomes can be compensated by similar chromosomes in the more closely related genomes. As in the AABBDD six chromosomes of common wheat, ABD has a similar nature, so can form a complete set (21) of the monomer and the lack of body. Wheat monomer and the lack of all have morphological variation, such as monomer 9, the performance of Spelled wheat: care Ying