منابع مشابه
Chromosomes in Maize and Maize Relatives »
An understanding of the laws of heredity is essential if improvement of plant breeding is to be controlled intelligently. A comprehensive understanding of the mechanism of inheritance demands definite knowledge of the chromosome number, not only of the forms it is desirous to improve but also of the related species. The present paper presents the results of a study of the chromosome number in s...
متن کاملMeiotic behavior of small chromosomes in maize
The typical behavior of chromosomes in meiosis is that homologous pairs synapse, recombine, and then separate at anaphase I. At anaphase II, sister chromatids separate. However, studies of small chromosomes in maize derived from a variety of sources typically have failure of sister chromatid cohesion at anaphase I. This failure occurs whether there is pairing of two copies of a minichromosome o...
متن کاملChromosome elimination in maize induced by supernumerary B chromosomes.
The regular chromosomal complement of maize consists of 20 chromosomes. These are known as the A set and are invariably present in this number in all normal diploid plants. Heteropycnotic regions known as "knobs" are found in characteristic positions on the different A chromosomes, although the number of knobs varies greatly in different strains. Knobless races are known, while others have as m...
متن کاملMapping maize sequences to chromosomes using oat-maize chromosome addition materials.
Oat- (Avena sativa) maize (Zea mays) chromosome additions are produced by crossing maize and oat. During early embryo development maize chromosomes are preferentially eliminated, and oat plants are often recovered that retain a single maize chromosome. Each of the 10 maize chromosomes recently has been isolated as a separate oat-maize addition. We describe here the mapping of 400 maize sequence...
متن کاملChromosome nondisjunction and instabilities in tapetal cells are affected by B chromosomes in maize.
Abnormal mitosis occurs in maize tapetum, producing binucleate cells that later disintegrate, following a pattern of programmed cell death. FISH allowed us to observe chromosome nondisjunction and micronucleus formation in binucleate cells, using DNA probes specific to B chromosomes (B's), knobbed chromosomes, and the chromosome 6 (NOR) of maize. All chromosome types seem to be involved in micr...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1912
ISSN: 0006-8071
DOI: 10.1086/330781