Two locally acting genetic controls of gene conversion, ccf-5 and ccf-6, in Ascobolus immersus
نویسندگان
چکیده
منابع مشابه
Gene Conversion in the Pasadena Strain of ASCOBOLUS IMMERSUS.
TUDIES on a strain of Ascobotus immersus collected in Pasadena, California ( Y u S U N 1964) have shown unusually high rates of gene conversion at a number of sites of white-spored mutations. In most such examples conversion ratios 5 t : 3w (wild type: white) and especially 3+: 5w have been common. Closely linked sites frequently have had very similar distributions of the different conversion r...
متن کاملThe suppression of gene conversion and intragenic crossing over in Ascobolus immersus: evidence for modifiers acting in the heterozygous state.
Four distinct systems cv1, cv2, cv4 and cv6 behaving as monogenic factors have been found in the stock 28 of Ascobolus immersus. They each specifically suppress gene conversion in a spore pigmentation gene (respectively, b1, b2, b4 and b6). In the gene b2, where this phenomenon was studied in most detail, the effect of cv2 on the suppression of gene conversion is almost total; intragenic recomb...
متن کاملExistence of homogeneous categories of mutants exhibiting various conversion patterns in gene 75 of Ascobolus immersus.
NE characteristic of intragenic recombination in Ascomycetes is nonreciprocal segregation (MITCHELL 1955). This results in ratios other than 2:2 for the four products of meiosis at one heterozygous site. The nonreciprocal segregation may either be meiotic, giving a ratio of 3:l (3 mutant spore pairs : 1 wildtype pair in an eight-spored ascus) or 1: 3 (1 mutant : 3 wild type) or postmeiotic, yie...
متن کاملDisparity of gene conversion in frameshift mutants located in locus b2 of Ascobolus immersus.
The frequency of conversion and the disparity in the direction of conversion were studied for six frameshift mutants lying in locus b2 of Ascobolus immersus and giving more 2 wild type:6 mutant (2+6m) than 6 wild type:2 mutant (6+2m) aberrant asci (type B). The frequency of conversion decreased from left to right in the locus. The disparity steadily increased from left to right and then reached...
متن کاملNon-locus-specific polygenes giving responses to selection for gene conversion frequencies in Ascobolus immersus.
Selection for higher and lower meiotic conversion frequencies was investigated in the fungus Ascobolus immersus. Strains carrying the same known gene conversion control factors, which have major effects on conversion frequencies at their specific target locus, sometimes gave significant differences in conversion frequency. Selection for high or low conversion frequencies at the w1-78 site was p...
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ژورنال
عنوان ژورنال: Genetical Research
سال: 1984
ISSN: 0016-6723,1469-5073
DOI: 10.1017/s0016672300025830