CenH3 evolution in diploids and polyploids of three angiosperm genera
نویسندگان
چکیده
منابع مشابه
Patterns of reproductive isolation in three angiosperm genera.
Analyses among animal species have found that reproductive isolation increases monotonically with genetic distance, evolves more quickly for prezygotic than postzygotic traits, and is stronger among sympatric than allopatric species pairs. The latter pattern is consistent with expectations under the reinforcement hypothesis. To determine whether similar trends are found among plant species, pat...
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Understanding the composition, evolution, and function of the Gossypium hirsutum (cotton) genome is complicated by the joint presence of two genomes in its nucleus (AT and DT genomes). These two genomes were derived from progenitor A-genome and D-genome diploids involved in ancestral allopolyploidization. To better understand the allopolyploid genome, we re-sequenced the genomes of extant diplo...
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Polyploidy, or whole genome duplication, has been an important feature of eukaryotic evolution. This is especially true in flowering plants, where all extant angiosperms have descended from polyploid species. Here we present a broad comparative analysis of the effect of polyploidy on flowering plant diversity. We examine the widely held hypothesis that polyploid flowering plants generate more d...
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Class I: Chromosome increase occurs in the first generation through the union of gametes one or both of which are unreduced. Can occur following selfor crosspollination. Class II: Chromosome doubling occurs in offspring of a hybrid with meiotic disturbances leading to unreduced gametes. It’s a second generation phenomenon: F2, BC1 or F1 crossed to a third parent. Class III: Chromosomal doubling...
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این تحقیق کوشیده است با انتخاب پنج رمان از میان آثار برگزیده، «چارلز دیکنز»، «جورج الیوت» و «توماس هاردی » و با رویکردی تطبیقی به بررسی درونمایه ی «ازدواج» در آثار این سه رمان نویس بزرگ دوره ی ویکتوریا بپردازد. فرضیه ی اولیه ی تحقیق این بوده است که چارلز دیکنز (1870- 1812) با زبانی شوخ و گزنده، جورج الیوت(1880- 1819) با نگاهی آموزشی–اندرزگونه و توماس هاردی(1928- 1840) با رویکردی تلخ وانتقادی به...
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ژورنال
عنوان ژورنال: BMC Plant Biology
سال: 2014
ISSN: 1471-2229
DOI: 10.1186/s12870-014-0383-3