On meiotic chromosomes in the genus <i>Crocus</i>
نویسندگان
چکیده
منابع مشابه
On the origin of sex chromosomes from meiotic drive.
Most animals and many plants make use of specialized chromosomes (sex chromosomes) to determine an individual's sex. Best known are the XY and ZW sex-determination systems. Despite having evolved numerous times, sex chromosomes present something of an evolutionary puzzle. At their origin, alleles that dictate development as one sex or the other (primitive sex chromosomes) face a selective penal...
متن کاملThe Strandedness of Meiotic Chromosomes from Oncopeltus
Meiotic chromosomes were isolated from male Oncopeltus fasciatus by dissecting the testes under insect Ringer's solution and spreading the living cells on the Langmuir trough. After being dried by the critical point method, preparations were examined under the electron microscope. Chromosomes at all stages of prophase prove to be multistranded. A significant increase in the number of parallel 2...
متن کاملthe impact of e-readiness on ec success in public sector in iran the impact of e-readiness on ec success in public sector in iran
acknowledge the importance of e-commerce to their countries and to survival of their businesses and in creating and encouraging an atmosphere for the wide adoption and success of e-commerce in the long term. the investment for implementing e-commerce in the public sector is one of the areas which is focused in government‘s action plan for cross-disciplinary it development and e-readiness in go...
Meiotic Recombination on Artificial Chromosomes in Yeast Lyle
We have examined the meiotic recombination characteristics of artificial chromosomes in Saccharomyces cereuisiae. Our experiments were carried out using minichromosome derivatives of yeast chromosome ZZZ and yeast artificial chromosomes composed primarily of bacteriophage X DNA. Tetrad analysis revealed that the artificial chromosomes exhibit very low levels of meiotic recombination. However, w...
متن کاملMeiotic behavior of small chromosomes in maize
The typical behavior of chromosomes in meiosis is that homologous pairs synapse, recombine, and then separate at anaphase I. At anaphase II, sister chromatids separate. However, studies of small chromosomes in maize derived from a variety of sources typically have failure of sister chromatid cohesion at anaphase I. This failure occurs whether there is pairing of two copies of a minichromosome o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Japanese Journal of Genetics
سال: 1944
ISSN: 0021-504X,1880-5787
DOI: 10.1266/jjg.20.128