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In others the synaptonemal complexes separate from the chromosomes at
diplonema, and may associate with one another and persist into later stages as “
polycomplexes.” In still others, notably in the spermatocytes and oocytes of
mammals, ...
The number ofchiasmata which are present determines theshape ofthe bivalents
at diplonema andlater stages. The numberof chiasmata is notconstant for
anygiven bivalent, butthereisa rough rulethatthelonger the bivalent the more
chiasmata ...
3
Cell Biology: Organelle Structure and Function
The synaptonemal complex at this stage is quite prominent in electron
microscopy but gradually disappears late in this phase. In the next stage,
diplonema (Greek: double thread), the paired chromosomes appear to repel
each other but are ...
4
Issues in Biochemistry and Biophysics Research: 2012 Edition
“Arguably, the most bizarre mitochondrial DNA (mtDNA) is that of the
euglenozoan eukaryote Diplonema papillatum. The genome consists of
numerous small circular chromosomes none of which appears to encode a
complete gene,” ...
5
The Evolutionary History of Nematodes: As Revealed in Stone, ...
Genus Diplonema n. gen. This is a collective genus for fossil Diplogastroidea
associated with members of the Diplopoda (millipedes). TYPE AND ONLY
SPECIES D. minuta n. gen., n. sp. Diplonema minuta n. gen., n. sp. (Figs 228-230
) This ...
6
Meiosis: Current Research. III.
(1966). In this respect, the cores of the X-Y pair behave like the cores of the
unpaired sections (univalents) of the chromosomes in the triploid Lilium tigrinum (
Moens, 1969). The cores of the sex pair remain thick and dense during
diplonema, ...
7
A Guide to the Protozoa of Marine Aquaculture Ponds
Diplonema has two flagella inserted into a small pocket just behind the front of
the cell. The flagella appear to be short and thick, and the cells often have large
particles of food in the flexible posterior end. Rhynchopus are similar to
Diplonema ...
D. J. Patterson, M. A. Burford, 2001
8
Principles of Plant Genetics and Breeding
Prophase 1: Is divisible into five substages-leptonema, zygonema, pachynema,
diplonema, diakinesis. Homologous chromosomes pair to form bivalents; each
chromosome duplicates; sister chromatids pair; chiasmata form: crossing-over ...
9
INTERNATIONAL REVIEW OF CYTOLOGY
Diplonema During diplonema the autosomes again begin to condense, but now
the homologs are not paired all along. The paracentromeric heterochromatin of
rodents remains deeply stained, but the number of basal knobs (see Section IV, ...
Geoffrey H. Bourne, James Frederic Danielli, Kwang W. Jeon, 1974
Diplonema and Diakinesis In diplonema, chromosomes continue to condense,
and chias- mata arise in each bivalent (Figure 20.5). Most bivalents have one to
three chiasmata (very rarely more). Chromosomes appear to repel each other ...
