Genetics of polymorphism in the land snail,Cepaea nemoralis
Genetics of polymorphism in the land snail,Cepaea nemoralis
复制标题
蜗牛多态性的遗传学
作者：
H. Wolda
本文报道了40个单对交配的陆地蜗牛Cepaea nemoralis的带型。共获得3678个F1个体，其中2315个在成年时评分，其余的在幼年时评分。结果表明，几种带型（例如12300、02300、00340、003300、00305）应归类为00300。额外（卫星）带的存在或不存在似乎是多因素控制的。有人建议，模式10345是显性超过12345，它是由一个等位基因的“三带”位点，隐性模式等位基因00345，或由一个不同的位点，但随后上位抑制的基因00345。在某些情况下，模式02345在遗传上是00345，而在其他情况下是12345。带4和带5的融合是多因素控制的，并且可能受颜色和三带性的基因座的影响或与其相关。带1和带2的融合似乎也是多因素控制的。这种融合与融合（45）密切相关，并且与颜色无关。苍白是隐性的深体色。后者发生在多因素控制的几种色调中。体色由红到黄为隐性遗传，有关基因与壳色基因连锁。在00300、00345、10345、红体色和淡体色位点上发现了显性表达的变异。
The results of 40 single-pair matings of the landsnailCepaea nemoralis, mostly concerning the rarer banding patterns are presented. A total of 3678 F1 individuals were obtained, 2315 of which were scored when adult, the remainder as juveniles.The presence or absence of band 3 in banded snails does not seem to be genetically determined. It is shown that several banding patterns (e.g. 12300, 02300, 00340, 003300, 00305) should be classified as 00300. The presence or absence of extra (satellite-) bands seems to be multifactorially controlled. It is suggested that pattern 10345 is dominant over 12345 and that it is determined either by an allele of the “threebanded” locus, recessive to pattern-allele 00345, or by a different locus but then epistatically suppressed by the gene for 00345. Pattern 02345 in some cases is genetically 00345 and in other cases 12345. Fusion of bands 4 and 5 is multifactorially controlled, and is perhaps influenced by, or linked to, the loci for colour and three-bandedness. Fusion of bands 1 and 2 seems to be also multifactorially controlled. This fusion is strongly correlated with fusion (45), and is independent of colour. Pale is recessive to dark body colour. The latter occurs in several shades which are multifactorially controlled. Reddish body colour is recessive to yellowish, and the gene concerned is linked with that for shell colour. Variation in the expression of dominance was found at the loci for 00300, 00345, 10345, reddish body colour and pale body colour.