草履虫 Syngen 4 的交配型遗传的突变分析。
Mutational Analysis of Mating Type Inheritance in Syngen 4 of PARAMECIUM AURELIA.
机构信息
Department of Zoology, Indiana University, Bloomington, Indiana 47401.
出版信息
Genetics. 1973 May;74(1):63-80. doi: 10.1093/genetics/74.1.63.
Six genic mutations restricting clones to mating type VII (O) were isolated in syngen 4, Paramecium aurelia. The only three extensively tested were neither allelic nor closely linked. A second type of mutation, allelic to one of the O restricted mutants, was also found. Clones homozygous for this mutant gene were selfers, producing both O and E (VIII) mating types, but only when they were progeny of mating type E parental clones. While all seven mutant genes behaved as recessives in monohybrid crosses, clones heterozygous at two different loci often demonstrated an unanticipated phenotype: selfing. The significance of the findings is discussed in relation to mating type determination and the evolution of mating type systems.
在 Paramecium aurelia 的同宗 4 中分离出了六个限制克隆到交配型 VII（O）的基因突变。在三个经过广泛测试的突变中，没有一个是等位基因或紧密连锁的。还发现了第二种类型的突变，与 O 限制突变体之一等位。这种突变基因纯合的克隆是自交的，产生 O 和 E（VIII）两种交配型，但仅当它们是 E 交配型亲本克隆的后代时才会产生。虽然所有七个突变基因在单杂交中都表现为隐性，但在两个不同基因座杂合的克隆中，经常表现出一种意想不到的表型：自交。这些发现的意义在与交配型决定和交配型系统的进化有关的方面进行了讨论。
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