Results 41 to 50 of about 11,135,105 (392)

Rapid interphase and metaphase assessment of specific chromosomal changes in neuroectodermal tumor cells by in situ hybridization with chemically modified DNA probes [PDF]

open access: yes, 1988
Repeated DNAs from the constitutive heterochromatin of human chromosomes 1 and 18 were used as probes in nonradioactive in situ hybridization experiments to define specific numerical and structural chromosome aberrations in three human glioma cell lines ...
A.H.N. Hopman   +64 more
core   +1 more source

Pre‐ and postzygotic mechanisms preventing hybridization in co‐occurring species of the Impatiens purpureoviolacea complex

open access: yesEcology and Evolution, 2021
In the species‐rich genus Impatiens, few natural hybrids are known, even though closely related species often occur sympatrically. In this study, we aim to bridge the gap between micro‐ and macro‐evolution to disentangle pre‐ and postzygotic mechanisms ...
Stefan Abrahamczyk   +6 more
doaj   +1 more source

Amplification of the androgen receptor may not explain the development of androgen-independent prostate cancer [PDF]

open access: yes, 2001
Objective To examine the role of androgen receptor (AR) gene amplification and aneusomy of the X chromosome in the development of antiandrogen-resistant prostate cancer.
Bartlett, J.M.S.   +5 more
core   +1 more source

Molecular Phylogenetics and Micromorphology of Australasian Stipeae (Poaceae, Subfamily Pooideae), and the Interrelation of Whole-Genome Duplication and Evolutionary Radiations in This Grass Tribe

open access: yesFrontiers in Plant Science, 2021
The mainly Australian grass genus Austrostipa (tribe Stipeae) comprising approximately 64 species represents a remarkable example of an evolutionary radiation.
Natalia Tkach   +7 more
doaj   +1 more source

Comparative chromosome painting discloses homologous Segments in distantly related mammals [PDF]

open access: yes, 1994
Comparative chromosome painting, termed ZOO-FISH, using DNA libraries from flow sorted human chromosomes 1,16,17 and X, and mouse chromosome 11 discloses the presence of syntenic groups in distantly related mammalian Orders ranging from primates (Homo
A Jauch   +56 more
core   +1 more source

The elusive evidence for chromothripsis. [PDF]

open access: yes, 2014
The chromothripsis hypothesis suggests an extraordinary one-step catastrophic genomic event allowing a chromosome to 'shatter into many pieces' and reassemble into a functioning chromosome.
Bafna, Vineet   +2 more
core   +1 more source

Number of nucleoli in diploids and polyploids of the genus Achillea L.

open access: yesActa Societatis Botanicorum Poloniae, 2014
Nucleoli were counted in 9228 interphase nuclei of the apical root meristem of 40 Achillea L. taxa (di-, tetra-. hexa- and octoploids). It was established that the distribution of nucleoli number in an interphase nucleus can be used as a rough practical ...
Janina Dąbrowska
doaj   +1 more source

Karyotypic Characteristics and Genetic Relationships of Apricot Accessions from Different Ecological Groups

open access: yesJournal of the American Society for Horticultural Science, 2020
The present study aims to reveal the karyotypic characteristics and genetic relationships of apricot (Prunus armeniaca L.) accessions from different ecological groups.
Wenwen Li   +7 more
doaj   +1 more source

Errors in chromosome segregation during oogenesis and early embryogenesis [PDF]

open access: yes, 2010
Errors in chromosome segregation occurring during human oogenesis and early embryogenesis are very common. Meiotic chromosome development during oogenesis is subdivided into three distinct phases.
A Dyban   +65 more
core   +1 more source

Cladogenetic and Anagenetic Models of Chromosome Number Evolution: a Bayesian Model Averaging Approach

open access: yesbioRxiv, 2016
Chromosome number is a key feature of the higher-order organization of the genome, and changes in chromosome number play a fundamental role in evolution.
William A. Freyman, S. Höhna
semanticscholar   +1 more source

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