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【正文】 of the cells were those with chromosome numbers 37,36 and 35. In the F5 generation, the plants with 2n=36 as the highest chromosome number were the most frequent (%), and those with 2n=38 were the second (%). In the F6 generation, the plants with 2n=36 as the highest chromosome number were again the highest (%), and those with 2n=35 were the second (%). The relationship between the cytological results and the fertility differences was preliminarily discussed. Finally ……Key words Raphanus sativus；Brassica oleracea；intergeneric hybrids；cytology；fertility。研究結(jié)果表明：F5代植株的染色體數(shù)目變異范圍為18至38，其中以36最多，%，主要集中于38，37，36和34；，在30至38之間，其中以36最多，%，主要集中于37，36和35。論文題目：黑體，小二號(hào)號(hào)字 北京農(nóng)學(xué)院教務(wù)處（見(jiàn)附件3示例） 其他：其他資料如畢業(yè)論文（設(shè)計(jì)）選題審批表、畢業(yè)論文（設(shè)計(jì)）任務(wù)書、畢業(yè)論文（設(shè)計(jì)）成績(jī)單、畢業(yè)論文（設(shè)計(jì)）評(píng)審標(biāo)準(zhǔn)等，并同開(kāi)題報(bào)告、文獻(xiàn)綜述等相關(guān)材料一并備案留存。 引言 1 正文 2 文中的圖、表、公式等與正文之間要有一行的間距，表格一律用三線表，并且論
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