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本文研究了天牛科3亚科9族20种的染色体核型。在所研究的20种天牛核型中,染色体以10对为主,其性染色体决定机制以Xyp为主。这种性别决定机制被认为是最原始的形式。Xyp,是大X染色体和小y染色体形成的降落伞状(parachute-like)的二价体。在细胞减数分裂中,雄性细胞呈现单倍体数目。研究发现,20种染色体中1/2种类其雄性单倍体数目为10,并且由Xyp型性染色体的性别决定机制。生物活细胞在24 h内均能制作成核型玻片。由于不同生物种类间的核型差异显著,本文对应用核型检测方法检测和鉴定有害生物的可行性进行探讨。
In this paper, we studied the chromosome karyotypes of 20 species of Cerambycidae, 3 subfamilies and 9 families. Among the 20 species tested, the chromosomes are dominated by 10 pairs of chromosomes, and the sex chromosome-determining mechanism is dominated by Xyp. This gender-determining mechanism is considered to be the most primitive form. Xyp, is a parachute-like bivalent body formed by the large X and small y chromosomes. In meiosis, male cells appear to be haploid. The study found that one out of 20 chromosomes had a male haploid number of 10 and was determined by the gender-specific mechanism of the Xyp sex chromosome. Bio-living cells can be made into nuclear-type slide within 24 h. Due to the significant differences in karyotypes among different species, this paper discussed the feasibility of detecting and identifying pests using karyotype detection methods.