Alternate-1 and alternate-2 disjunctions in heterozygous reciprocal translocations.
نویسنده
چکیده
Alternate-1 and alternate-2 orientation of chromosomes, as well as the two types of adjacent orientation, were observed cytologically in the ring configurations of three reciprocal translocation heterozygotes of Gossypium hirsutum L. The observations indicate that the two types of alternate orientation should be characteristic of ring-forming translocations.
منابع مشابه
Reciprocal translocations in grass pea (Lathyrus sativus L.): pattern of transmission, detection of multiple interchanges and their independence.
Grass pea (Lathyrus sativus L.) is a diploid crop having 2n = 14 chromosomes. Four different plant types, heterozygous for reciprocal translocation (RT), RT-1, RT-2, RT-3, and RT-4 showing pollen semisterility, were isolated in induced mutant population of three varieties of grass pea. Transmission rate of these 4 translocations was studied in advanced selfed and intercrossed progenies, whereas...
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RECIPROCAL translocation between nonhomologous chromosomes may be Adetected cytologically by observing an interchange complex at metaphase I. The interchange complex may occur either as an alternate or adjacent configuration, that is, zigzag or open ring or chain. In some species, the frequency of pollen mother cells with one or the other configurations is approximately equal; in other species,...
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BACKGROUND Human translocation carriers may present alterations in meiosis. Understanding the mechanism of meiotic segregation of reciprocal translocations is important for estimation of the risk of either pregnancy loss or birth defects. The objective of this work was to estimate meiotic segregation rates in preimplantation embryos from preimplantation genetic diagnosis (PGD) cycles of female ...
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Reciprocal translocations produce imbalances by three types of disjunction which are, in decreasing frequency, adjacent 1, 3:1, and adjacent 2. Adjacent 1 disjunction produces duplication deficiencies of inverse topography to those of adjacent 2. The imbalanced chromosome segments in one of these types are balanced in the other. The disjunction 3:1 produces pure trisomies and monosomies. The fo...
متن کاملAlternate-1 and alternate-2 orientations in interchange (reciprocal translocation) quadrivalents.
The dynamic properties of the spindle, and published numerical data, argue that the differentiation of alternate-1 and alternate-2 orientations of an interchange quadrivalent is real and meaningful, contra Boussy (1982).
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ورودعنوان ژورنال:
- Genetics
دوره 77 1 شماره
صفحات -
تاریخ انتشار 1974