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see crossing overcrossing over,
process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At that stage each chromosome has replicated into two strands called sister chromatids.
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the paired temporary association of homologous chromosomes during which an exchange of homologous chromosomal areas may occur. Under the influence of various factors, chromosomes readily contract into a ball during synapsis. The British scientist D. E. Moore described this phenomenon and introduced the term “synapsis” in 1895.


(cell and molecular biology)
Pairing of homologous chromosomes during the zygotene stage of meiosis.
References in periodicals archive ?
Crucially, the synapses can also be stacked in three dimensions (3D) to make large systems that could be used for computing.
Deterioration or loss of synapses can result in changes in mood and cognition, and in alterations of brain functioning, such as those associated with neurological disorders or aging.
To circumvent the difficulty in analyzing CNS synapses, isolated preparations of the nervous system, such as dissociated neuronal cultures, were extensively utilized to identify the nascent synapses formed between CNS neurons.
Clq is a member of the complement cascade, a group of immune system proteins that calls in microglial cells to gobble up synapses or cells.
Sulzer said, "although lower numbers of synapses in some brain areas have been detected in brains from older patients and in mice with autistic-like behaviors.
Through a range of experiments, they showed that when a brain cell receives signals from a neighbouring cell across a synapse, it actually releases SIRP-alpha into the space between the cells.
To calculate the number of invaginated synapses per square micrometer, the mid region of the lower lensed eye was divided into three zones (Figs.
Prana's lead Alzheimer's disease compound, PBT2, targets a toxic form of the Abeta protein in the synapses of the brain by inhibiting the interaction between Abeta and zinc.
There clearly were more synapses found in subjects with intellectually skilled professions, such as engineering or teaching," says James E.
Popular discussions of the new brain science trade heavily on what happens to synapses during infancy and childhood.
GABA is one of the chemicals, called neurotransmitters, which flow across the gaps between nerve cells and synapses.
Instead of strengthening the right connections, the brain simply eliminates the weak synapses connected to the wrong place prior to eye opening.