نتایج جستجو برای: meiotic behavior
تعداد نتایج: 630961 فیلتر نتایج به سال:
Allopolyploid species contain more than two sets of related chromosomes (homoeologs) that must be sorted during meiosis to ensure fertility. As polyploid species usually have multiple origins, one intriguing, yet largely underexplored, question is whether different mechanisms suppressing crossovers between homoeologs may coexist within the same polyphyletic species. We addressed this question u...
Background: About 15% of couples have fertility problems and male factor in fertility accounts for half of the cases. In vitro generation of germ cells introduces a novel approach to male infertility and provides an effective system in gene tracking studies, however many aspects of this process have remained unclear. We aimed to promote mouse embryonic stem cells (mESCs) differentiation into ge...
ژن های خانواده piwi ، ژن هایی کاملاً محافظت شده در طی تکامل می باشند که نقش مهمی را در فرایند-هایی نظیر خودبازسازی سلول های بنیادی، گامتوژنز و تداخل rna در ارگانیسم های مختلف از arabidopsis تا انسان ایفا می نمایند. piwil2 که hili نیز نامیده می شود یکی از چهار همولوگ شناخته شده پروتئین های piwi در انسان محسوب می گردد. بیان ژن piwil2 در سلول های جنسی موجود در بافت بیضه مبین نقش کلیدی این ژن در شکل...
Meiotic behavior and pollen fertility were analysed in five Epimedium species: Epimedium chlorandrum, Epimedium acuminatum, Epimedium davidii, Epimedium ecalcaratum and Epimedium pubescens. Chromosome numbers for five species were 2n = 2x = 12. All examined species displayed stable meiotic process and high pollen fertility (>76.67%). Meiotic abnormality partially affected pollen fertility. At m...
Abstract The genus Schinus (Anacardiaceae) comprises 30 species found in Peru, Bolivia, Chile, Paraguay, Uruguay, Argentina and Brazil. terebinthifolia (Brazilian pepper tree) is socioeconomically important the Brazilian state of Espírito Santo. Dried fruit used as a pepper-like spice natural populations are exploited. Studies on meiotic behavior pollen stainability from an ecological evolution...
a cytogenetical study on 13 alfalfa (medicago sativa) cultivars available in iranian forest and rangelands genebank was performed in order to obtain basic information on the variability in chiasma frequency/distribution, chromosome association and segregation. such cytogenetic information is useful for planning hybridization programs. cluster analysis of meiotic data and ordination of cultivars...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید