13／17染色体易位猪群Amy－2的多态性

Genetic Polymorphism of Amylase-2 in Homozygotes andHeterozygotes for 13/17 Robertsonian Translocation and Normal Karyotype Pigs

用聚丙烯酰胺凝胶电泳法测定了１３／１７染色体易位纯合子、杂合子及染色体数正常猪群的血液淀粉酶－２（Ａｍｙ－２）的遗传多态性。结果：３群猪均表现出特殊的Ａｍｙ－２多态性分布，其Ａｍｙ－２位点受２对等位基因控制，除测得Ａｍｙ－２Ａ、Ａｍｙ－２Ｂ基因控制的Ａ、Ｂ带外，还测到１对迁移率比Ａ、Ｂ带快的Ｃ、Ｄ带；２对等位基因呈现出共显性特征，但除个别个体２对等位基因所控制的表型染色强度相同外，大部分个体出现Ｄ带染色较Ａ、Ｂ、Ｃ带弱的特点；不同核形猪群的基因频率和基因型频率有明显差异，个别个体缺乏Ａｍｙ－２Ｃ、Ａｍｙ－２Ｄ基因。

Genetic polymorphism of Amylase-2 were examined in homozygotes andheterozygotes for 13/17 Robertsonian translocation and normal karyotype pigs withpolyacryamide gel electrophoresis. All three populations showed special Amy-2 poly-morphism The Amy-2 phenotypes were modified by two pairs of codominant alleles,Amy-2A and Amy-2B and one additional faster pair Amy-2c and Amy-2B. The gene fre-quency and genotype frequency were significantly different among three populations.