路德类酵母中四型四分体的罕见出现。
Rare occurrence of the tetratype tetrads in Saccharomycodes ludwigii.
作者信息
Yamazaki T, Ohara Y, Oshima Y
出版信息
J Bacteriol. 1976 Feb;125(2):461-6. doi: 10.1128/jb.125.2.461-466.1976.
Abstract
Genetic data suggesting the absence of crossover in Saccharomycodes ludwigii have been described. Tetrad data obtained from 888 asci from 60 pairs of genes with 22 genetic markers showed the absence of tetratype asci, except for 5 asci in which a single pair of alleles showed tetratype segregation to the other genetic markers in each ascus. Spore arrays in the linear asci showed that the + - + - and + - - + (or - + + -) asci occurred at almost equal frequencies. The two coherent spores at each end of an ascus were always marked with different alleles of a gene.
摘要
已有研究描述了表明路德类酵母（Saccharomycodes ludwigii）不存在交叉的遗传数据。从具有22个遗传标记的60对基因的888个四分体囊中获得的四分体数据显示，除了5个四分体囊外，不存在四型四分体囊，在这5个四分体囊中，每一个囊中有一对等位基因相对于其他遗传标记表现出四型分离。线性四分体囊中的孢子阵列表明， + - + - 和 + - - +（或 - + + -）四分体囊出现的频率几乎相等。四分体囊两端的两个连贯孢子总是标记着一个基因的不同等位基因。
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