The Effect of Abnormal Chromosome 10 on Preferential Segregation and Crossing over in Maize.
نویسندگان
چکیده
منابع مشابه
Preferential Segregation in Maize.
H E orientation of a bivalent on the metaphase plate is usually a t T random so that the distribution of any one of the two homologues to a specific pole of the spindle figure is wholly a matter of chance. The validity of this statement is established by the large number of cases in many diverse organisms in which I : I genetic ratios are obtained when the two homologous chromosomes are marked ...
متن کاملCrossing over and Diploid Egg Formation in the Elongate Mutant of Maize.
Rhoades (1941) found recombination in the proximal regions of chromosome 5 to be higher in male than in female flowers. Two explanations were proposed to account for the lower female values, namely: (1) there is a basic difference in rates of crossing over in mega- and microsporocytes, or (2) selective orientation of the chromosome 5 bivalent on the meiotic spindle leads to the preferential seg...
متن کاملCrossing over and Anaphase I Distribution of the Chromosomes of a Maize Interchange Trivalent.
PREDICTION of genetic segregation ratios from polyploids and polysomics is usually complicated by the necessity of simultaneous estimation of crossover frequencies and frequencies of the modes of anaphase I distribution. In a special hyperploid maize stock, the frequency of chiasma formation in one arm of a trivalent configuration and the relative frequencies of disjunctive and nondisjunctive d...
متن کاملMarcus Rhoades on Preferential Segregation in Maize.
On Christmas Day 1941,GENETICS received a gift: amanuscript from Marcus Rhoades describing an unexpected violation ofMendelian inheritance inmaize. This was the first report of preferential segregation; a phenomenon later known as meiotic drive. Rhoades was studying a variant form of chromosome 10 with a conspicuous abnormality; it carried extensive heterochromatin at the tip of the long arm. T...
متن کاملFour loci on abnormal chromosome 10 contribute to meiotic drive in maize.
We provide a genetic analysis of the meiotic drive system on maize abnormal chromosome 10 (Ab10) that causes preferential segregation of specific chromosomal regions to the reproductive megaspore. The data indicate that at least four chromosomal regions contribute to meiotic drive, each providing distinct functions that can be differentiated from each other genetically and/or phenotypically. Pr...
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ورودعنوان ژورنال:
- Genetics
دوره 53 5 شماره
صفحات -
تاریخ انتشار 1966