Abstract
The synaptonemal complex (SC) in the diploid Rhoeo consists of 2 amorphous lateral elements, each about 46.0 nm thick, and one amorphous central element about 30.0 nm thick. The central region is about 115.0 nm wide. SC in the triploid have essentially the same dimensions as those of the diploid; both lateral (46.0 nm) and central (30.0 nm) elements are amorphous, and the central region is about 117.5 nm wide. The coil, observed in both diploid and triploid, is a modified short segment of SC with several twists at the end of a synapsed bivalent that is attached to the nuclear membrane. Serial sections in a diploid cell reveal that a coil extends inwards about 3.5 micron from the nuclear membrane and makes a complete turn at a distance of every 0.5 micron. There is a correlation between the modified ends of SC and terminal chiasmata in Rhoeo. The coils might have a positive role in the process of crossing over, or alternatively might be involved in ring formation by holding chromosome ends together while chiasmata are not involved. SC are present in chromocentres of both diploid and triploid. Chromocentres in diploid and triploid are indistinguishable, and appear to be formed from the aggregation of pericentromeric heterochromatin as a result of translocations which occured close to the centromeres. 3-dimensional hypothetical pachytene configuration of the diploid is presented.
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Claims 11
Claim · model-written summary
Diploid Rhoeo synaptonemal complexes have two 46.0 nm lateral elements and a 30.0 nm central element.
Verbatim
e0“The synaptonemal complex (SC) in the diploid Rhoeo consists of 2 amorphous lateral elements, each about 46.0 nm thick, and one amorphous central element about 30.0 nm thick”
Claim · model-written summary
The diploid central region is about 115.0 nm wide.
Verbatim
e0“The central region is about 115.0 nm wide”
t0“Rhoeo”
Claim · model-written summary
Triploid lateral elements are 46.0 nm thick.
Verbatim
e0“SC in the triploid have essentially the same dimensions as those of the diploid; both lateral (46.0 nm) and central (30.0 nm) elements are amorphous, and the central region is about 117.5 nm wide”
t0“Rhoeo”
Claim · model-written summary
Triploid central elements are 30.0 nm thick.
Verbatim
e0“both lateral (46.0 nm) and central (30.0 nm) elements are amorphous, and the central region is about 117.5 nm wide”
t0“Rhoeo”
Claim · model-written summary
Triploid central region is about 117.5 nm wide.
Verbatim
e0“the central region is about 117.5 nm wide”
t0“Rhoeo”
Claim · model-written summary
Coils in both ploidies are twisted short SC segments at nuclear membrane attached bivalent ends.
Verbatim
e0“The coil, observed in both diploid and triploid, is a modified short segment of SC with several twists at the end of a synapsed bivalent that is attached to the nuclear membrane”
t0“Rhoeo”
Claim · model-written summary
A diploid coil extends inward about 3.5 micron.
Verbatim
e0“a coil extends inwards about 3.5 micron from the nuclear membrane and makes a complete turn at a distance of every 0.5 micron”
t0“Rhoeo”
Claim · model-written summary
A diploid coil makes a turn every 0.5 micron.
Verbatim
e0“a coil extends inwards about 3.5 micron from the nuclear membrane and makes a complete turn at a distance of every 0.5 micron”
t0“Rhoeo”
Claim · model-written summary
Modified SC ends correlated with terminal chiasmata.
Not reportedDirection
Verbatim
e0“There is a correlation between the modified ends of SC and terminal chiasmata in Rhoeo”
Claim · model-written summary
SC occur in chromocentres of diploids and triploids.
Verbatim
e0“SC are present in chromocentres of both diploid and triploid”
t0“Rhoeo”
Claim · model-written summary
Diploid and triploid chromocentres are indistinguishable.
Verbatim
e0“Chromocentres in diploid and triploid are indistinguishable”
t0“Rhoeo”