异源多倍体 - 百度百科
异源多倍体（allopolyploid）生物学名词，指不同物种杂交产生的 杂种后代 经过 染色体加倍 形成的多倍体。 常见的多倍体植物大多数属于异源多倍体，例如，小麦、 燕麦 、棉、烟草、 苹果 、梨、 樱桃 、菊、水仙、 郁金香 等。 对应的有 同源多倍体，同一物种经过染色体加倍形成的多倍体，称为同源多倍体。 偶倍数异源多倍体是 生物进化 的重要因素。 多倍体 植物中大多数是异源多倍体。 常见的异源多倍体有小麦、燕麦、棉、烟草、苹果、梨、樱桃、菊、水仙、郁金香等。 …
The genome and population genomics of allopolyploid - Nature
2024年4月15日 · We present chromosome-level assemblies of a di-haploid C. arabica accession and modern representatives of its diploid progenitors, C. eugenioides and C. canephora. The three species exhibit largely...
Allopolyploidy Definition and Examples - Biology Online
2021年3月1日 · In allopolyploidy, the additional set of chromosome s comes from another species (i.e. from two or more diverged taxa). The cell or the organism in allopolyploidy state is referred to as allopolyploid. Wheat is an example of an allopolyploid with six chromosome sets.
Polyploidy - Wikipedia
While most polyploid species are unambiguously characterized as either autopolyploid or allopolyploid, these categories represent the ends of a spectrum of divergence between parental subgenomes. Polyploids that fall between these two extremes, which are often referred to as segmental allopolyploids, may display intermediate levels of polysomic ...
Allopolyploidy - an overview | ScienceDirect Topics
Allopolyploidy: Presence of three or more sets of chromosomes from at least two different species origins. Bivalents: Pairs of parental chromosomes physically linked by cross-overs (e.g. chiasmata) during early stage meiotic cell division, more specifically from diakinesis up till metaphase I. Cytological: Relating to the cell.
Allopolyploidy & Autopolyploidy | Speciation & Examples
2023年11月21日 · Allopolyploidy occurs when an organism has more than two sets of chromosomes from different species. An example of allopolyploidy is Gossypium, a species of cotton, which are hybrids formed from...
Transposon signatures of allopolyploid genome evolution
2023年6月1日 · Here, we develop a statistical framework for identifying evolutionarily coherent subgenomes within allopolyploid genomes that relies on transposable elements to group chromosomes into sets with...
染色體倍性 - 维基百科，自由的百科全书
染色體倍性 是指細胞內 同源染色體 的數目，只有一組最基本的稱為 單套 或 單倍體 （haploid），兩組備份稱為 雙套 或 二倍體 （diploid）。 多倍體的細胞則有更多套的染色體。 有些常見生物就是多倍體（polyploid），譬如 金魚 、 鮭魚 、 螞蟥 、 扁形蟲 、 有尾目 和 蕨類植物。 多套的動物通常都是 低等動物，或能行 孤雌生殖 的居多。 這種多倍體，又分異源多倍體（Allopolyploidy）和 同源多倍體 （Polyploid或Autopolyploidy，或「單源多倍體」），特別 …
Allopolyploidy - an overview | ScienceDirect Topics
In general, allopolyploid speciation through the HGD pathway has three important stages: formation of viable and fertile F 1 hybrid (stage I), formation of allopolyploid through HGD (stage II), and establishment of the allopolyploid as a species (stage III) (Fig. 4.1).
Allopolyploidization - an overview | ScienceDirect Topics
Allopolyploidization is a self-organization process in which the gene networks of the two parental species merge in the same cells without intentional network manipulation. The prevalence of polyploid species suggests that the inherent advantages of network merging can outweigh its …