作者: Emmenagogue 時(shí)間: 2025-3-21 22:04
Avian Sex Chromosomes and Sex-Linked Genesopy each of the Z and W sex chromosomes, whereas the homogametic males have two identical Z chromosomes. Given the very distinct nature of mammalian and avian sex chromosomes, the sex determination pathway in birds is unlikely to resemble that in mammals, where the presence of the . gene product exc作者: 身心疲憊 時(shí)間: 2025-3-22 03:21
Genes and Sex Determination in Medakax determination genes initiate a series of developmental processes that establish the male or female phenotype. The genetic scenarios how sex can be determined are of extraordinary diversity and have provoked questions on the evolution and maintenance of bisexuality. One of the unsolved problem is, 作者: Jingoism 時(shí)間: 2025-3-22 05:28
Evolution of the Y Chromosome in Primatesability is mostly caused by polymorphism in the length of the constitutive heterochromatin located in the long arm in Yq12. It is characterized by its bipartite structure and function. It is flanked by pseudoautosomal regions at the distal short arm (PAR1) and distal long arm (PAR2), the sequences o作者: SYN 時(shí)間: 2025-3-22 10:17
The Male Hypermethylation (MHM) Region on the Chicken Z Chromosome: Female-Specific Transcription anation of testis in a dosage dependent manner, because XY individuals hemizygous for these genes exhibit a high frequency of XY feminization (Raymond .., 1999a). In mouse embryos, the expression of . gene is first detected by RT-PCR at E9.5, the earliest stage of genital ridge formation, and its expr作者: Stagger 時(shí)間: 2025-3-22 14:22 作者: Stagger 時(shí)間: 2025-3-22 20:46
The X Chromosome Plays a Special Role During Speciation which a formerly unique species gets separated into two different species by reproductive isolation. Darwin viewed speciation as “the mystery of mysteries”. According to our present view speciation describes the last steps during the evolutionary process which gave rise to the respective species. e作者: 領(lǐng)帶 時(shí)間: 2025-3-23 00:24 作者: Occupation 時(shí)間: 2025-3-23 04:26
Expression and Chromatin Binding Specificity of Ki-67 in Male and Female Meiosis of the Mouseins are permanent components of chromosomes, whereas others might only be temporarily linked to chromosomes or chromosomal segments. Such a protein is the Ki-67 protein (pKi-67). The pKi-67 is exclusively expressed in proliferating cells in all stages of the cell cycle but absent in G. cells. (Gerde作者: 變態(tài) 時(shí)間: 2025-3-23 08:56 作者: 愛得痛了 時(shí)間: 2025-3-23 11:07
Meiotic Chromosomes and Meiotic Mechanisms bonus for geneticists, who have yeast as a very handy model, and a curse for evolutionists, who look for a primitive and perhaps simple kind of meiosis. In fact, few eukaryotes can be pointed out as absolute asexual, that is lacking sex reproduction and the vestiges of sexual ancestors. Perhaps Sou作者: Suggestions 時(shí)間: 2025-3-23 17:56
The Nuclear Envelope at the Attachment Sites of Mammalian Meiotic Telomerest aspects of this process. For example, an essential step during meiotic prophase is the synapsis of homologous chromosomes. In order to find each other, homologous chromosomes, which initially occupy different nuclear territories, have to move. However, the mechanisms governing long distance chromo作者: 植物群 時(shí)間: 2025-3-23 20:53
Interphase Cytogenetics in Understanding Chromosome and Telomere Dynamics During Prophase I: Implica whole chromosomes and subregions in nuclei, which usually lack chromosome-specific landmarks accessible to conventional staining methods. The possibility to simultaneously label several targets in interphase nuclei has led to widespread use of this technique in diagnostic settings and investigation作者: FOIL 時(shí)間: 2025-3-24 01:11 作者: Enliven 時(shí)間: 2025-3-24 03:22
Chromosomal Translocations in Leukaemia: Emerging Networksnetic analysis. Almost 40 years ago it was noted that a peculiar small chromosome was a constant feature of chronic myeloid leukaemia (CML) (Nowell and Hungerford, 1960). This so-called Philadelphia chromosome was initially thought to be a partially deleted G-group chromosome. However, it became app作者: carbohydrate 時(shí)間: 2025-3-24 07:46
https://doi.org/10.1007/978-3-658-06557-7e between the two. There are variants of both types e.g. XX/X, X.X.X.X./X.X.Y, XX/XY.Y., Z/ZZ, W.W.Z/ZZ and even more complex systems. But even multiple sex chromosomes segregate as a single unit in meiosis of the heterogametic sex.作者: Critical 時(shí)間: 2025-3-24 11:11
Sex Chromosome Evolution: Evidence from Fish, Fly and Moth Speciese between the two. There are variants of both types e.g. XX/X, X.X.X.X./X.X.Y, XX/XY.Y., Z/ZZ, W.W.Z/ZZ and even more complex systems. But even multiple sex chromosomes segregate as a single unit in meiosis of the heterogametic sex.作者: 憤慨一下 時(shí)間: 2025-3-24 15:54
Genes and Sex Determination in Medakawhy such a simple and highly conserved biological phenomenon as the existence of males and females should be controlled by so different mechanisms like the ratio of X chromosomes to autosomes for instance in the fruit fly . and the worm . or the presence of a Y chromosome in male mammals.作者: Uncultured 時(shí)間: 2025-3-24 21:40 作者: 行為 時(shí)間: 2025-3-25 02:01 作者: 挖掘 時(shí)間: 2025-3-25 03:55
https://doi.org/10.1007/978-3-658-08421-9why such a simple and highly conserved biological phenomenon as the existence of males and females should be controlled by so different mechanisms like the ratio of X chromosomes to autosomes for instance in the fruit fly . and the worm . or the presence of a Y chromosome in male mammals.作者: Genome 時(shí)間: 2025-3-25 09:38
https://doi.org/10.1007/978-3-658-08421-9f which are shared by, and undergo meiotic recombination with the X chromosome. Between these two PARs there is the non-recombining region of the human Y chromosome (NRY), which comprises about 95% of the chromosome. This NRY does not undergo sexual recombination and is thus male-specific.作者: 亞麻制品 時(shí)間: 2025-3-25 13:14 作者: 裹住 時(shí)間: 2025-3-25 17:49 作者: 恃強(qiáng)凌弱 時(shí)間: 2025-3-25 20:01
Ross P. Anderson,Dejan Milutinovi?er, homologous chromosomes, which initially occupy different nuclear territories, have to move. However, the mechanisms governing long distance chromosome movements are poorly understood (for review see Loidl, 1990; Zickler and Kleckner, 1998; Sybenga, 1999; Scherthan, 2001).作者: 熱心 時(shí)間: 2025-3-26 02:15
The X Chromosome Plays a Special Role During Speciationeries”. According to our present view speciation describes the last steps during the evolutionary process which gave rise to the respective species. e.g. human speciation lasts back 5–6 million years when the common ancestor of human and chimpanzee lived. We view evolution as a discontinuous process of single speciation events.作者: 高腳酒杯 時(shí)間: 2025-3-26 07:29
The Nuclear Envelope at the Attachment Sites of Mammalian Meiotic Telomereser, homologous chromosomes, which initially occupy different nuclear territories, have to move. However, the mechanisms governing long distance chromosome movements are poorly understood (for review see Loidl, 1990; Zickler and Kleckner, 1998; Sybenga, 1999; Scherthan, 2001).作者: PLE 時(shí)間: 2025-3-26 09:23 作者: Obscure 時(shí)間: 2025-3-26 15:05 作者: 旅行路線 時(shí)間: 2025-3-26 17:17 作者: 剝削 時(shí)間: 2025-3-26 23:34
Avian Sex Chromosomes and Sex-Linked Genesvian . homolog(s) argues against its role in avian sex determination. However, a recent study suggests that at least some genes associated with gonadal development are conserved among mammals and birds (Smith .., 1999).作者: 上坡 時(shí)間: 2025-3-27 04:35
Meiotic Chromosomes and Meiotic Mechanismsrotists cannot be safely thought as coming from asexual ancestors. It may be remarked that the asexual stercorarian trypanosomes show large variations in nuclear DNA content and “electrokaryotype” (reviewed in Solari, 1995) while protists having regular sex cycles and meiosis, as ., show a much more constant karyotype (Gardner, 1999).作者: 織布機(jī) 時(shí)間: 2025-3-27 08:15
https://doi.org/10.1007/978-3-642-79351-6999b) but later its expression becomes male (testis)-specific as in mammals (this study; Figure 2A,B). In early chicken embryos at stages 25–31 (4.5- to 7-day), the level of . mRNA is about 2-fold higher in males than in females (Raymond .., 1999b and this study), which might have been attained by t作者: 動脈 時(shí)間: 2025-3-27 13:27
Termersetzung modulo einer Kongruenz,hromosomes have been the object of speculation since the discovery of sex chromosomes by McClung (1901). For the evolution of sex chromosomes it is assumed that starting from the differential locus in the heterogametic sex the state of permanent heterozygosity is spread further into the flanking reg作者: gain631 時(shí)間: 2025-3-27 15:30
Mathematical Foundations and Notation,1996; Verheijen .., 1989b). During mitosis pKi-67 seems to be a constituent of a perichromosomal layer (Gautier .., 1992; Verheijen .., 1989a). Data on expression and location of pKi-67 during the meiotic divisions are scarce. Wrobel .. (1996) reported on the expression of pKi-67 in the seminiferous作者: 青春期 時(shí)間: 2025-3-27 19:33
https://doi.org/10.1007/978-3-031-17597-8n and telomere dynamics during first meiotic prophase. It will be discussed that mammalian KU70 dsDNA end-binding protein may not play a structural role at the meiotic telomere. I will discuss a putative pathway linking the meiotic telomere to cell cycle progression, cytoskeleton and nuclear envelop作者: Encapsulate 時(shí)間: 2025-3-28 01:02
Multistage Rocket Trajectory Re-planning, studies of cells from these diseases, although they constitute only a small fraction of all human cancers. Second, the resolution of banding analysis is for obvious reasons roughly one chromosome band, and since a typical band contains millions of bases and hundreds of genes, that is a rather low r作者: 最小 時(shí)間: 2025-3-28 02:35 作者: 胰臟 時(shí)間: 2025-3-28 08:40
The Male Hypermethylation (MHM) Region on the Chicken Z Chromosome: Female-Specific Transcription an999b) but later its expression becomes male (testis)-specific as in mammals (this study; Figure 2A,B). In early chicken embryos at stages 25–31 (4.5- to 7-day), the level of . mRNA is about 2-fold higher in males than in females (Raymond .., 1999b and this study), which might have been attained by t作者: dyspareunia 時(shí)間: 2025-3-28 13:34
Neo-X and Neo-Y Chromosomes in ,hromosomes have been the object of speculation since the discovery of sex chromosomes by McClung (1901). For the evolution of sex chromosomes it is assumed that starting from the differential locus in the heterogametic sex the state of permanent heterozygosity is spread further into the flanking reg作者: 莊嚴(yán) 時(shí)間: 2025-3-28 18:18
Expression and Chromatin Binding Specificity of Ki-67 in Male and Female Meiosis of the Mouse1996; Verheijen .., 1989b). During mitosis pKi-67 seems to be a constituent of a perichromosomal layer (Gautier .., 1992; Verheijen .., 1989a). Data on expression and location of pKi-67 during the meiotic divisions are scarce. Wrobel .. (1996) reported on the expression of pKi-67 in the seminiferous作者: 農(nóng)學(xué) 時(shí)間: 2025-3-28 20:37 作者: Tincture 時(shí)間: 2025-3-29 02:21 作者: 騷擾 時(shí)間: 2025-3-29 06:24 作者: 流利圓滑 時(shí)間: 2025-3-29 08:19 作者: BRIBE 時(shí)間: 2025-3-29 12:16
978-90-481-5855-3Springer Science+Business Media Dordrecht 2004作者: 愚笨 時(shí)間: 2025-3-29 17:48 作者: agonist 時(shí)間: 2025-3-29 19:54
https://doi.org/10.1007/978-3-658-20160-9opy each of the Z and W sex chromosomes, whereas the homogametic males have two identical Z chromosomes. Given the very distinct nature of mammalian and avian sex chromosomes, the sex determination pathway in birds is unlikely to resemble that in mammals, where the presence of the . gene product exc作者: 很像弓] 時(shí)間: 2025-3-30 03:07
https://doi.org/10.1007/978-3-658-08421-9x determination genes initiate a series of developmental processes that establish the male or female phenotype. The genetic scenarios how sex can be determined are of extraordinary diversity and have provoked questions on the evolution and maintenance of bisexuality. One of the unsolved problem is, 作者: 無禮回復(fù) 時(shí)間: 2025-3-30 07:35
https://doi.org/10.1007/978-3-658-08421-9ability is mostly caused by polymorphism in the length of the constitutive heterochromatin located in the long arm in Yq12. It is characterized by its bipartite structure and function. It is flanked by pseudoautosomal regions at the distal short arm (PAR1) and distal long arm (PAR2), the sequences o作者: Blood-Vessels 時(shí)間: 2025-3-30 10:03 作者: 彩色 時(shí)間: 2025-3-30 16:18
Termersetzung modulo einer Kongruenz, after the occurrence of a sex differentiator into two structurally and functionally different partners (Muller, 1932; Bull, 1983; Charlesworth, 1991; Steinemann and Steinemann, 1998; Lucchesi, 1999), X and Y chromosome (or Z and W). Often the Y chromosome evolves into a heterochromatic and genetica作者: 殖民地 時(shí)間: 2025-3-30 18:58 作者: Bumble 時(shí)間: 2025-3-31 00:42 作者: 大范圍流行 時(shí)間: 2025-3-31 04:41
Mathematical Foundations and Notation,ins are permanent components of chromosomes, whereas others might only be temporarily linked to chromosomes or chromosomal segments. Such a protein is the Ki-67 protein (pKi-67). The pKi-67 is exclusively expressed in proliferating cells in all stages of the cell cycle but absent in G. cells. (Gerde作者: 蛛絲 時(shí)間: 2025-3-31 05:29 作者: 典型 時(shí)間: 2025-3-31 10:52
Ross P. Anderson,Dejan Milutinovi? bonus for geneticists, who have yeast as a very handy model, and a curse for evolutionists, who look for a primitive and perhaps simple kind of meiosis. In fact, few eukaryotes can be pointed out as absolute asexual, that is lacking sex reproduction and the vestiges of sexual ancestors. Perhaps Sou
