Speciation by polyploidy - Biology Stack Exchange By definition, polyploidy just means that a cell or organism contains more than 2 pairs of homologous chromosomes (or is more than 2n) This is more common in plants than it is in animals The plant, as shown below, undergoes failed meiosis, which means that the diploid (2n) cells never become haploid (n)
evolution - Why is polyploidy lethal for some organisms while for . . . Polyploidy is an important evolutionary mechanism which was and is probably responsible for a great deal of biological diversity Polyploidy arises easily in both animals and plants, but reproductive strategies might prevent it from propagating in certain circumstances, rather than any reduction in fitness resulting from the genome duplication
Newest polyploidy Questions - Biology Stack Exchange Polyploidy is the multiplication of number of chromosomal sets from 2n to 3n (triploidy), 4n (tetraploidy) and so on It is quite common in plants, for example many crops like wheat or Brassica forms
Why is polyploidy much more common in plants than in animals? Example- formation of Barr Body in human females (Note that this has nothing to do with polyploidy, but happens since females have one X chromosome more than males) Whereas gene dosage in polyploid palnts has been exploited for improved agricultural yields as they have shown better productivity than their diploid couterparts
Why does polyploidy give an evolutionary advantage? I would like to know what advantages polyploidy holds I have come across a few examples during my research of polyploidy, for example human adults' hearts contain 27% diploid, 71% tetraploid and 2% octaploid nuclei, Deinococcus radiodurans can have up to 10 copies of genome, and most of the plants consumed by humans have more than 2 copies
How do we know for sure that Morus nigra (black mulberry) is . . . Wikipedia's Polyploidy and Morus nigra; Description both point out that Morus nigra or black mulberry is tetratetracontaploidic and cite two sources that both point to a third source in Plos One; Zheng et al (2015) Definition of Eight Mulberry Species in the Genus Morus by Internal Transcribed Spacer-Based Phylogeny
evolution - Polyploidy, or why plants of different species can produce . . . Chromosomal doubling (polyploidy) occurs more frequently in plants and facilitates the fertility of the hybrid offspring Outcomes of the successful hybridization of different species of plants (i e yelding fertile offspring) can be easily observed in agriculture - for instance, Triticum aestivum is 6n, while Triticum durum is 4n
Why was polyploidy not lethal in certain octodontid rodents? Polyploidy arises easily in both animals and plants, but reproductive strategies might prevent it from propagating in certain circumstances, rather than any reduction in fitness resulting from the genome duplication In fact, try rereading that answer and the references therein, it answers your general question
Are free-nuclear division and endomitosis the same? But when again this cell enters s phase there again the genetic material replicated ie 2 nucleus having 4n condition is formed this is free nuclear mitosis These chromosomes doesn't separate in anaphase due to failure in attachment of spindle fibres So karyokinesis also get stopped resulting cell to 8n condition or polyploidy This is endomitosis