雌性虾夷扇贝与雄性栉孔扇贝杂交子代及其亲本的核型研究

采用滴片法制片-吉姆萨染色对雌性虾夷扇贝(Patinopecten yessoensis)与雄性栉孔扇贝(Chla-mysfarreri)杂交子代及其双亲的核型进行了研究,报道了在扇贝杂交过程中产生的特殊的细胞遗传学现象,结果表明,栉孔扇贝染色体核型2n=38=6m+10sm+22st;虾夷扇贝染色体核型2n=38=6m+10sm+16st+6t;两者杂交子代染色体数目2n=38,但其染色体组型不符合预期型,不是简单地由两个亲本各自一套染色体组型组合而成,呈现出复杂的形态多态性,端部着丝点染色体明显增多.

Karyotypes of hybrid scallop(hybridizing cross the female Patinopecten yessoensis with the male Chlamys farreri) and their parents

The karyotypes of hybrid scallop(hybridizing cross the female Patinopecten yessoensis with the Chlamys farreri) and their parents were studied and compared by colchine hypotonic air drying-Giemsa staining.Some cytogenetic specificities were detected.The karyotype of C.farreri was found to be 2n=38=6m 10sm 22st,while the karyotype of P.yessoensis was 2n=38=6m 10sm 16st 6t.The chromosome number of the hybrid is 2n=38,however,the karyotypes are quite different from the expectative types,much more number of telocentric chromosomes appear.Moreover, obvious polymorphism of karyotypes was examined in the hybrids izatims.