Figure

Wed, 2020-03-18 14:08 -- hwadmin
Summary: 
Fig. 2.1. Genome analyser methods developed in the 1920s based on chromosome pairing relationships in the interspecific hybrids documented polyploidy and delineated evolutionary relationships and feasibility and monitoring of gene transfer via wide hybridisation. Einkorn (Triticum monoccoum L.) was shown to have 2n = 14 chromosomes based on observation of seven bivalents at metaphase I (MI) of meiosis (top left), the dicoccum (T. turgidum L.) had 2n = 28 chromosomes observed as 14 bivalents at MI (top right) and the dinkel (T. aestivum L.) had 2n = 42 chromosomes observed as 21 bivalents at MI (bottom left). Each bivalent consists of a homologous chromosome pair held together by chiasmata – the cytological manifestation of crossing over and recombination. The F1 hybrids of diccocum/einkorn showed seven bivalents (grey) and seven univalents (top middle) indicating that they shared one genome and diccocum carried one genome of unknown origin. The F1 hybrids of dinkel/diccocum showed 14 bivalents indicating that they shared two genomes in common and dinkel had one unique genome not found in einkorn or dicoccum. The fact that chromosomes of einkorn, diccocum and dinkel paired meant that genetic transfers were possible from einkorn to dicoccum and from dicoccum to dinkel.
Type: 
Figure
Sub Component: 
Normal
Slug: 
F1
Highwire: Type: 
fragment
HighWire: Journal/Corpus Code: 
csirobk
Highwire: pisa_id: 
csirobk;9781486308095/1/BK07734_ch2/F1
Highwire: pisa_master: 
csirobk;9781486308095/1/BK07734_ch2/F1
HighWire: Atom Path: 
/csirobk/9781486308095/9781486308095/SEC6/SEC8/F1.atom
Highwire: cpath: 
/content/9781486308095/9781486308095/SEC6/SEC8/F1
Image - Large: 
Highwire: cpathalias: 
/content/csirobk/9781486308095/9781486308095/SEC6/SEC8/F1
Image - Medium: 
Highwire: Variants: 
expansion
Image - Small: 
Highwire: State: 
Released
Contributors: 
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