白色獭兔蓝眼突变体的发现与遗传分析

Discovery and genetic analysis of blue-eyed mutant in the white rex rabbits

文章设计了杂交、回交和全同胞交配3个实验,对美系白色獭兔(♂)和青紫蓝肉兔(♀)杂交所产生的白色蓝眼獭兔突变体的遗传机制进行了等位性测试。结果表明,白色獭兔蓝眼突变体是维也纳座位(V)发生隐性突变的结果。基因v纯合(vv)对家兔基本毛色基因座(A、B、C、D、E)具有隐性上位作用,无论其他毛色座位的基因型如何,只要vv存在即可产生白色蓝眼兔。vv基因型与rr基因型组合即可产生白色蓝眼獭兔。白色蓝眼獭兔突变体在我国家兔育种中是一个新发现,其遗传机制的阐明,对獭兔育种和生产具有重要的指导意义。

Using cross,backcross,and full-sib mating experiments,allelism test was conducted to study the genetic mechanism of blue-eyed mutant of the white rex rabbits originated from the F1 generation from the cross American White rex rabbits（♂） × Chinchilla meat rabbits（♀）.The study showed that the reason for the blue-eyed mutant of the white rex rabbits was a recessive mutation in Vienna locus.When the V locus was homozygous for the recessive v gene,it was recessive epistatic to other loci（including A,B,C,D,and E）,which also controlled the coat color.Regardless of the genotypes in other gene loci,the rabbits appeared blue eyes and white coat color as long as the genotype vv occurred at the Vienna locus.Thus,the combination of genotype vv and genotype rr will produce the blue-eyed and the white rex rabbits.As the blue-eyed mutant of the white rex rabbits is a new finding in China’s rabbit breeding program,it is significant to explain the genetic mechanism of the blue-eyed mutant for the breeding and production of rex rabbits.