广西地处亚热带和北热带,森林资源丰富,树木种类繁多,其中有许多种类是生产上常用的用材林树种、经济林树种和绿化观赏树种;也有不少属稀有珍贵树种。随着林业生产的发展和绿化工作的开展,加强对我区树木的研究很有必要。染色体是主要遗传物质的载体。每种生 Guangxi is located in the subtropical and tropical North China. There are abundant forest resources and a wide variety of trees. There are many species of timber species, economic tree species and green ornamental species commonly used in production. There are also many rare and precious tree species. With the development of forestry production and greening work, it is necessary to strengthen the research on the trees in our district. Chromosomes are the carriers of major genetic material. Each student