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表型比率
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     OBJECTIVE To investigate the antibiotic resistant phenotyping of Acinetobacter spp on NC21 panel.
     目的研究不动杆菌属在NC21板上耐药表型比率
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     Abnormalities on the Immuno-phenotypes in Patients with Myelodysplastic Syndrome
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     The tiller primordia was developed earlier in the arl1 mutants than in the wild-type plants.
     1.表型分析:
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  phenotypic ratio
The data for stearic acid content in F2 seeds of the KK-2×M25 cross satisfactorily fit a 3:9:1:3 phenotypic ratio.
      
In the F 2generation, which was obtained by self-pollination, segregation of the Hyp-lines in a 3:1 phenotypic ratio with regard to the traits frost tolerance and proline content was observed.
      
The observed phenotypic ratio fit a two-locus model.
      
Moreover, some treatments considerably influenced the phenotypic ratio in the F2 population for such traits as petal colour and number of side shoots.
      


The inheritance of coat colour in pigs was investigated from data on 4617 piglets (403 litters) involving 16 mating combinations. It is concluded that white colour in Landrace and Large white is dominant to headham black colour in the fine local breed Tongcheng Swine. All the progeny (1572 piglets from matings of Landrace or Large White (Y) to a variety of crossbred carrying the gene for non-white colour is white as well. Heterozygotes in the Y x (LxT) ♂♂ were mated with homozygous recessive individuals (T)...

The inheritance of coat colour in pigs was investigated from data on 4617 piglets (403 litters) involving 16 mating combinations. It is concluded that white colour in Landrace and Large white is dominant to headham black colour in the fine local breed Tongcheng Swine. All the progeny (1572 piglets from matings of Landrace or Large White (Y) to a variety of crossbred carrying the gene for non-white colour is white as well. Heterozygotes in the Y x (LxT) ♂♂ were mated with homozygous recessive individuals (T) ♀♀ to produce a total of 102 backeross pigs. Foity-seven of these pigs are white, whereas the remaining55pigs are nonwhite, the ratio of colour phenotype comforms to 1∶1(x_2~C0.05). The results of the remeinder nine mating (8-16mating) combinations, except one, are also discordant with what was expected theoretically. It is necessary to diagnose carriers of recessive non-white genes, cull them and lower speedily the gene frequency of non-white colour in developing the Hubei white Swine and its own lines. For this reason, three kinds of methods of test cross (test matings) for colour were used: (1) A candidate whose genetype is unknown mated to a homozygous recessive individual (T); (2) A candidate boar (sow) mated to known a heterozygous sow (boar); (3) A candidate boar mated to sows in the general population. Through test cross 14 boars were proved to be free of non-white genes at a certain lavel of prohability and all the pigs they afterwards produce are white. It has been proved by practice that using above methods of test cross for diagnosis carriers of recessive non-white genes can obtain more accuracy. Selection for white colour based on the conclusion from the information of test mating is effective.

用16种交配组合所产4617头仔猪的毛色研究证实:长白猪和大约克猪的白毛色对地方良种猪的两头黑毛色为显性。与几种携带有非白毛基因的杂种交配所产的1572头仔猪同样全为白毛。当用大长通中的杂合子公猪同纯合隐性通城母猪回交时,所得102头回交仔猪中47头为白色,55头为非白色,毛色表型比率与1:1相符(x_c~20.05)。杂合子公猪相交所得的457头仔猪中白毛与非白毛分别为355头与102头,符合予期的3:1(P>0.05)。其余9个交配组合中(8—19组),除一个组合外,也都与预期相符。在培育湖北白猪及其品系的工作中,识别非白毛基因的携带者并予以淘汰,迅速地降低非白毛基因频率。采用三种毛色测交法:(Ⅰ)未知基因型的被测者同纯合隐性个体通城猪交配;(Ⅱ)被测公(母)猪同已知为杂合子的母(公)猪交配;(Ⅲ被测公猪与大群母猪交配。在一定概率水平下被判定为不携带非白毛基因的显性纯合子。公猪在以后的交配所产的仔猪,全为白毛。证明用测定交法以识别非白毛在因携带者的准确性较高,根据测交结果并藉以选择白毛是有效的。

 
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