Results 151 to 160 of about 343,749 (184)

Meiotic abnormalities in backcross lines of hybrid Haemonchus

International Journal for Parasitology, 1980
Abstract Le Jambre L. F. and Royal W. M. 1979. Meiotic abnormalities in backcross lines of hybrid Haemonchus. International Journal for Parasitology10: 281–286. Hybrid worms from the reciprocal matings between Haemonchus contortus and H. placei were backcrossed to the parent species.
L F, Le Jambre, W M, Royal
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Meiotic Abnormalities: Abnormal Numbers of Chromosomes

2001
A neuploidy is the loss or gain of individual chromosomes. It can be the result of nondisjunction in a premeiotic mitotic division in the germline of either parent, a first or second meiotic division in either parent, or an early embryonic mitotic (postzygotic) division in the affected individual.
Orlando J. Miller, Eeva Therman
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TPX2 deficiency leads to spindle abnormity and meiotic impairment in porcine oocytes

Theriogenology, 2022
The targeting protein for Xklp2 (TPX2) is a spindle assembly factor, that can stimulate microtubule formation and promote spindle completion during mitosis. However, the role of TPX2 in mammalian oocyte meiotic maturation is still not fully understood.
Yijing He, Lei Peng, Jia Li, Qiao Li, Yajie Chu, Qixin Lin, Rong Rui, Shiqiang Ju   +7 more
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The maize abnormal chromosome 10 meiotic drive haplotype: a review

Chromosome Research, 2022
The maize abnormal chromosome 10 (Ab10) haplotype encodes a meiotic drive system that converts heterochromatic knobs into centromere-like bodies that are preferentially segregated through female meiosis. Ab10 was first described in the 1940s and has been intensively studied.
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Study on Haploid Inducing and Its Meiotic Abnormality in Maize

Agricultural Sciences in China, 2009
Abstract The haploid-inducing line Stock 6 was used to produce haploid maize and expected to obtain maize haploid plants successfully. The detailed meiotic studies on selected haploid maize (n = x = 10) were conducted. Cytogenetic analysis revealed a high frequency of meiotic abnormality occurred in both meiosis I and meiosis II.
Qi-lin TANG, Yun-chao FENG, Xue-li HAN, Ming-min ZHENG, Ting-zhao RONG   +4 more
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Origin of chromosomal abnormalities: Evidence for delayed fertilization in meiotic nondisjunction

Human Genetics, 1983
This study ascertained 35 aneuploid patients, of which 34 had trisomy 21 and one had trisomy 18. Their parents were matched by age at the conception with parents of 35 euploid patients with congenital defects. Interviews with the couples focused on exposures and activities at the time of the conception. No parents had infectious hepatitis preceding the
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SPONTANEOUS MEIOTIC CHROMOSOME ABNORMALITIES IN MALE MICE (MUS MUSCULUS)

Canadian Journal of Genetics and Cytology, 1971
Three types of spontaneous meiotic chromosome aberrations were described in mouse spermatocytes: (1) Precocious separation of XY chromosomes was observed in about 6% of cells in diakinesis and first metaphase; (2) chromosome degeneration appeared in 9.2 and 4.8% of cells at pachytene and at first metaphase, respectively; (3) polyploidy, in particular ...
C C, Lin, W S, Tsuchida, S A, Morris
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First meiotic division abnormalities in human oocytes: mechanism of trisomy formation

Cytogenetics and Cell Genetics, 2008
Trisomy is the single most frequent type of chromosome abnormality in humans and has considerable impact on many aspects of human pathology. It arises most commonly through “nondisjunction” at maternal meiosis I, but the underlying mechanism of formation remains obscure.
R R, Angell, J, Xian, J, Keith, W, Ledger, D T, Baird   +4 more
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DNA fragmentation and meiotic segregation in sperm of carriers of a chromosomal structural abnormality

Fertility and Sterility, 2009
To determine the meiotic segregation and DNA fragmentation in spermatozoa of carriers of a chromosomal structural abnormality.Case series.University hospital.Thirty-seven male carriers of a chromosomal structural abnormality (21 with a balanced reciprocal translocation, 7 with a robertsonian translocation, 9 with a pericentric inversion).Meiotic ...
Aurore, Perrin, Emilie, Caer, Maria, Oliver-Bonet, Joaquima, Navarro, Jordi, Benet, Véronique, Amice, Marc, De Braekeleer, Frédéric, Morel   +7 more
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A new meiotic abnormality inZea mays: multiple spindles associated with abnormal cytokinesis in both divisions

Genome, 2001
We report here a new meiotic abnormality recorded in one plant of an inbred line of Zea mays. After an apparently normal prophase I, chromosomes did not congregate in a single metaphase plate. Bivalents remained scattered in the cytoplasm, giving rise to several spindles.
C M, Caetano-Pereira, M S, Pagliarini
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