Results 81 to 90 of about 343,749 (184)
Post-Meiotic Intra-Testicular Sperm Senescence in a Wild Vertebrate [PDF]
, 2012 There is growing interest in sperm senescence, both in its underlying mechanisms and evolutionary consequences, because it can impact the evolution of numerous life history traits. Previous studies have documented various types of sperm senescence, but
Richard H. Wagner +16 more
core +2 more sources
Selection Does Operate Primarily on Genes: In Defense of the Gene as the Unit of Selection [PDF]
, 2008 Natural selection is an important force that shapes the evolution of all living things by determining which individuals contribute the most descendents to future generations.
Sapienza, Carmen
core
, 1990 Tissue culture can induce changes in chromosome structure and number in common wheat (Triticum aestivum L.). The type and frequency of such changes were evaluated in primary regenerants extracted from calli of four immature embryos of 'Norstar' winter ...
Ernest D. P. Whelan
core +1 more source
Crop Breeding and Applied Biotechnology, 2007 Meiotic abnormalities in potato hamper sexual recombination, due to their influence on pollen production and viability rate. In this study we evaluated pollen viability and meiosis of three clones of Solanum commersonii commersonii Dun.
Lisete Chamma Davide +4 more
doaj
A case of penta X syndrome caused by nondisjunction in maternal meiosis 1 and 2
Clinical Case Reports, 2017 Key Clinical Message The prenatal abnormalities in patients with penta X syndrome appear late in pregnancy and are nonspecific. In contrast, the postnatal phenotype is well described although new findings are still revealed.
Sara Markholt +4 more
doaj +1 more source
Unleashing meiotic crossovers in hybrid plants
, 2017 Significance In eukaryotes, meiotic recombination shuffles genetic information at each generation, making each offspring unique. In addition to its key role in heredity and evolution, this gene reshuffling is central in plant and animal ...
Larchevèque, Cécile +9 more
core +1 more source
Meiotic observation on ‘Bartzella’, an intersectional hybrid of Paeonia
Xibei zhiwu xuebao[Objective] Most intersectional hybrids in Paeonia are triploids and generally sterile, producing a small number of hybrid offspring. Observing the meiotic chromosome behaviors of ‘Bartzella’, an intersectional hybrid with high ornamental value and ...
RONG Qi +5 more
doaj +1 more source
Assessment on cytotoxic and mutagenic potency of Gamma rays and EMS in Vigna mungo L. Hepper
Biotecnología Vegetal, 2019 To determine the mutagen agent potency and deduce an optimum dose, cytological analysis for induced chromosomal aberrations is considered as an accurate index in mutation breeding.
Sonu Goyal +4 more
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Chromosome segregation and meiotic defects in carriers of chromosomal abnormalities
, 2009 Male carriers of chromosomal abnormalities (CA) are more frequent in the infertile population. These men have higher levels of sperm aneuploidy due to the aberrant segregation of the chromosomes involved in the abnormality. The presence of a CA may also influence the segregation of other chromosomes, in a process known as in interchromosomal effect ...
openaire +1 more source
Crop Breeding and Applied Biotechnology, 2016 This study evaluated the mode of reproduction, the meiotic behavior and the pollen viability of three tetraploid plants (2n=4x=40) originated from somatic chromosome duplication of Paspalum notatum plants. The plant WKS 3 changed the mode of reproduction
Karine Cristina Krycki +2 more
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