Most sexually reproducing organisms are diploid, with paired chromosomes, but doubling of their chromosome number may occur due to errors in cytokinesis. This can occur early in development to produce an autopolyploid or partly autopolyploid organism, or during normal processes of cellular differentiation to produce some cell types that are polyploid (endopolyploidy), or during gamete formation. An allopolyploid plant may result from a hybridisation event between two different species. Both autopolyploid and allopolyploid plants can often reproduce normally, but may be unable to cross-breed successfully with the parent population because there is a mismatch in chromosome numbers. These plants that are reproductively isolated from the parent species but live within the same geographical area, may be sufficiently successful to form a new species. Some otherwise sterile plant polyploids can still reproduce vegetatively or by seed apomixis, forming clonal populations of identical individuals. Durum wheat is a fertile tetraploid allopolyploid, while bread wheat is a fertile hexaploid. The commercial banana is an example of a sterile, seedless triploid hybrid. Common dandelion is a triploid that produces viable seeds by apomictic seed.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What can cause the doubling of chromosome pairs?
Ah, so.. errors in cytokinesis

Sometime after the publication of the Eclogues (probably before 37 BC), Virgil became part of the circle of Maecenas, Octavian's capable agent d'affaires who sought to counter sympathy for Antony among the leading families by rallying Roman literary figures to Octavian's side. Virgil came to know many of the other leading literary figures of the time, including Horace, in whose poetry he is often mentioned, and Varius Rufus, who later helped finish the Aeneid.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What work was Virgil the most proud of?
Ah, so.. unanswerable

Arsenal appointed Herbert Chapman as manager in 1925. Having already won the league twice with Huddersfield Town in 192324 and 192425 (see Seasons in English football), Chapman brought Arsenal their first period of major success. His revolutionary tactics and training, along with the signings of star players such as Alex James and Cliff Bastin, laid the foundations of the club's domination of English football in the 1930s. Under his guidance Arsenal won their first major trophies victory in the 1930 FA Cup Final preceded two League Championships, in 193031 and 193233. In addition, Chapman was behind the 1932 renaming of the local London Underground station from "Gillespie Road" to "Arsenal", making it the only Tube station to be named specifically after a football club.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What was the name of one of Arsenal's coaches prior to 1925?
Ah, so..
unanswerable