leptotene
简明释义
英[ˈleptə(ʊ)tiːn]美[ˈleptoʊˌtiːn]
n. (细胞分裂中的)细线期
英英释义
Leptotene is the first stage of prophase I in meiosis, characterized by the condensation of chromatin into long, thin threads of chromosomes. | leptotene是减数分裂中前期I的第一阶段,特征是染色质凝缩成细长的染色体丝。 |
单词用法
在细丝期阶段 | |
细丝期染色体 | |
减数分裂的细丝期阶段 | |
细丝期细胞 | |
细丝期发育 | |
细丝期的特征 |
同义词
细丝期 | 细丝期是减数分裂前期 I 的第一阶段。 | ||
前期 I | During leptotene, chromosomes begin to condense and become visible under a microscope. | 在细丝期,染色体开始凝缩,并在显微镜下变得可见。 |
反义词
厚线期 | During meiosis, the chromosomes become thicker during pachytene. | 在减数分裂过程中,染色体在厚线期变得更粗。 | |
双线期 | Diplotene is characterized by the separation of homologous chromosomes. | 双线期的特征是同源染色体的分离。 |
例句
1.The results showed that the mother pollen cells presented decreased ribosome numbers at leptotene and zygotene stages, and simplified mitochondria structure;
花粉发育过程做了超微结构观察。结果表明,在花粉母细胞细线和偶线期,核糖体数量减少、线粒体结构简化;
2.The results showed that the mother pollen cells presented decreased ribosome numbers at leptotene and zygotene stages, and simplified mitochondria structure;
花粉发育过程做了超微结构观察。结果表明,在花粉母细胞细线和偶线期,核糖体数量减少、线粒体结构简化;
3.Prophase may be divided into successive stages termed leptotene, zygotene, pachytene, diplotene, and diakinesis.
前期可被分为连续的阶段:细线期、偶线期、粗线期、双线期和终变期。
4.During prophase I of meiosis, chromosomes begin to condense during leptotene, which is the first stage of this phase.
在减数分裂的前期I中,染色体开始在leptotene阶段凝缩,这是这一阶段的第一阶段。
5.The pairing of homologous chromosomes starts shortly after leptotene begins.
同源染色体的配对在leptotene开始后不久就会启动。
6.Researchers observed that certain proteins are expressed specifically during leptotene in germ cells.
研究人员观察到某些蛋白质在生殖细胞的leptotene阶段特异性表达。
7.In studies of genetic recombination, leptotene is crucial for understanding how chromosomes interact.
在遗传重组的研究中,leptotene对理解染色体如何相互作用至关重要。
8.The transition from leptotene to zygotene marks a significant step in meiotic prophase.
从leptotene到合子期的过渡标志着减数分裂前期中的一个重要步骤。
作文
In the realm of biology, particularly in the study of genetics and cell division, the term leptotene refers to a specific stage during meiosis, which is the process by which germ cells divide to produce gametes. During leptotene, the chromosomes begin to condense and become visible under a microscope, marking the initial phase of prophase I of meiosis. This stage is crucial for the proper segregation of chromosomes, as it sets the foundation for the subsequent stages of meiosis. Understanding leptotene is essential for students and researchers alike, as it plays a significant role in the overall process of sexual reproduction. In this phase, homologous chromosomes, which are pairs of chromosomes containing the same genes but possibly different alleles, start to undergo pairing, a process known as synapsis. This pairing is vital because it allows for genetic recombination, where segments of DNA are exchanged between the paired chromosomes. This genetic exchange contributes to genetic diversity in offspring, which is a fundamental aspect of evolution and adaptation. The significance of leptotene extends beyond just the mechanics of cell division; it also has implications in understanding various genetic disorders. Errors during meiosis can lead to conditions such as Down syndrome or Turner syndrome, which arise from nondisjunction events—where chromosomes fail to separate properly. By studying the leptotene stage and its associated processes, scientists can gain insights into how these errors occur and develop potential strategies for prevention or treatment. Moreover, advancements in technology, such as fluorescence microscopy, have allowed researchers to observe the leptotene stage in greater detail than ever before. Such technologies enable them to visualize the behavior of chromosomes during this critical phase, providing a deeper understanding of the molecular mechanisms involved. As a result, research on leptotene not only enhances our knowledge of basic biological processes but also paves the way for breakthroughs in medical science. In conclusion, the study of leptotene is a fascinating intersection of biology, genetics, and medicine. It highlights the complexity of cellular processes and their impact on life itself. By delving into the intricacies of leptotene and its role in meiosis, we can appreciate the delicate balance of genetic inheritance and the importance of maintaining genetic integrity. As we continue to explore the depths of cellular biology, the insights gained from studying stages like leptotene will undoubtedly enrich our understanding of life and its myriad forms.
在生物学领域,特别是在遗传学和细胞分裂的研究中,术语leptotene指的是减数分裂过程中一个特定的阶段,即生殖细胞分裂以产生配子的过程。在leptotene阶段,染色体开始凝缩并在显微镜下变得可见,标志着减数分裂I期前期的初始阶段。这个阶段对于染色体的正确分离至关重要,因为它为减数分裂的后续阶段奠定了基础。 理解leptotene对学生和研究人员而言都是必不可少的,因为它在性繁殖的整体过程中扮演着重要角色。在这一阶段,同源染色体,即含有相同基因但可能具有不同等位基因的染色体对,开始进行配对,这一过程称为联会。这种配对是至关重要的,因为它允许基因重组,即在配对染色体之间交换DNA片段。这种遗传交换有助于后代的遗传多样性,这是进化和适应的基本方面。 leptotene的意义不仅限于细胞分裂的机制;它还与理解各种遗传疾病相关。减数分裂中的错误可能导致唐氏综合症或特纳综合症等情况,这些情况源于非分离事件——染色体未能正确分离。通过研究leptotene阶段及其相关过程,科学家可以深入了解这些错误是如何发生的,并制定潜在的预防或治疗策略。 此外,技术的进步,如荧光显微镜,使研究人员能够比以往更详细地观察leptotene阶段。这些技术使他们能够可视化在这一关键阶段染色体的行为,从而提供对涉及的分子机制更深刻的理解。因此,对leptotene的研究不仅增强了我们对基本生物过程的知识,也为医学科学的突破铺平了道路。 总之,研究leptotene是生物学、遗传学和医学的迷人交汇点。它突显了细胞过程的复杂性及其对生命本身的影响。通过深入探讨leptotene及其在减数分裂中的作用,我们可以欣赏到遗传继承的微妙平衡以及维持遗传完整性的重要性。随着我们继续探索细胞生物学的深度,从研究像leptotene这样的阶段中获得的见解无疑将丰富我们对生命及其多样形式的理解。
文章标题:leptotene的意思是什么
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