nondisjunction of newly replicated sister chromatidse0
Verbatim
e0
“The initial event responsible for the occurrence of breakages and lagging chromosomes was characterized by the nondisjunction of newly replicated sister chromatids, which was observed to occur preferentially at the knob level”
“the negative relationship found between Bs and heterochromatic knobs allowed us to propose the existence of an intragenomic conflict between these elements.”
The B drive mechanism causes detrimental effects through adherence of heterochromatic knobs and A centromeres at the mitosis preceding sperm development
adherence of heterochromatic knobs and apparently A centromeres at the mitosis preceding sperm developmente5
Verbatim
t0
“maize”
e5
“Collectively, the results reveal two backgrounds in which the B drive mechanism is not confined to this chromosome causing detrimental effects by adherence of heterochromatic knobs and apparently A centromeres at the mitosis preceding sperm development”
absence of hybridization signals in all maize knobse7
Qualifier
heterochromatic regions were lost during the Z. perennis genome evolutione7
Verbatim
e7
“the absence of hybridization signals in all maize knobs indicate that these heterochromatic regions were lost during the Z. perennis genome evolution”
“The finding of unequal crossing over in the cultures supports the conclusion that the amplification in the culture 12-F would be derived from this mechanism”
t0
“Alterations in Heterochromatic Knobs in Maize Callus Culture by Breakage-Fusion-Bridge Cycle and Unequal Crossing Over”
“The knobs, referred to as collicles, were found to be the result of connecting mucilage canal ‘bridges’ over vascular bundles, connecting mucilage canals situated between adjacent parallel vascular bundles”
“These non-nucleolar transcriptional units may correspond to genes coding for the heterodisperse nuclear RNA (hnRNA) and the knobs of 23 nm could be related to informofers or hnRNA particles.”
Red sheath color, large grain size and triangular fruitcase in teosinte appear to reflect adaptation of particular teosinte populations rather than maize introgression.
Red sheath color, large grain size, triangular fruitcasee2
Qualifier
reflect the adaptation of particular teosinte populationse2
Verbatim
e2
“Red sheath color, large grain size, triangular fruitcase -and the presence of internal chromosome knobs, all characters attributed to maize introgression into teosinte, appear rather to reflect the adaptation of particular teosinte populations”
a substance, secreted by the leaf-nodule-bacteriae0
Not reportedTaxon
Verbatim
e0
“It is probable that the formation of the knobs is due to a substance, secreted by the leaf-nodule-bacteria, which cluster on the growing point and die by the treatment of antibiotic or of heat, and that this knob-forming substance may also acts on the formation of leaf nodules to some extent”
vegetatively propagated by simple techniques (cuttings, basal knobs, suckers)e0
Verbatim
e0
“Olive, grape, date, and fig can be vegetatively propagated by simple techniques (cuttings, basal knobs, suckers) and were thus preadapted for domestication early in the development of agriculture.”
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Zea mays