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An ascus (from Ancient Greek ἀσκός (askós) 'skin bag, wineskin'; pl.: asci) [1] is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division.
There are 2000 identified genera and 30,000 species of Ascomycota. The unifying characteristic among these diverse groups is the presence of a reproductive structure known as the ascus, though in some cases it has a reduced role in the life cycle. Many ascomycetes are of commercial importance.
Recent figures indicate that there are more than 1.4 billion insects for each human on the planet, [27] or roughly 10 19 (10 quintillion) individual living insects on the earth at any given time. [28] An article in The New York Times claimed that the world holds 300 pounds of insects for every pound of humans. [28]
This is a collection of lists of mammal species by the estimated global population, divided by orders.Lists only exist for some orders; for example, the most diverse order - rodents - is missing.
Amongst the world's top 25 most endangered primates. [30] Golden bamboo lemur: Hapalemur aureus: ... there are about 490 golden lion tamarins in 150 zoos around the ...
[5] [6] [7] Global population estimates for many of these at this time would lack accuracy. All numbers are estimates, because they are taken by observation , and a given number of 50 slender-billed curlews does not necessarily mean there are 10 more of this species than the black stilt , which has been estimated at 40: there is a possibility ...
Per Forbes (April 2024) [1]; Rank Rank per capita Country/Territory Billionaires Rate - World 2,781: 0.343 1 11 United States 813: 2.420 2 53 China 406: 0.288 3 58 India 200: 0.144
The ascus itself forms as a radiating spur branch at the top of the hook. Each nucleus divides, resulting in the formation of a pair of compatible nuclei, i.e. a dikaryon, in the ascus, which is now the penultimate space. Two sister nuclei remain, one in the basal cell and the other in the crozier tip.