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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 ?
TEHRAN (FNA)- Neuroscientists have uncovered the existence of loose coupling between calcium channels and release sensors of exocytosis at a mature central synapse in the rodent brain.
In the new study, the team studied SIRP alpha function in the brain -- and started to understand its role in synapse stabilization.
Sanes' team found a variety of age-related differences between the synapses of the young and old mice.
The sticky synapse; cell adhesion molecules and their role in synapse formation and maintenance.
In one cortical-axon group, one-fifth of the synapses that the researchers tracked had been replaced after 1 week.
Two of the proteins, thrombospondin 1 and 2, led to the development of synapses -- albeit functionally incomplete ones.
There clearly were more synapses found in subjects with intellectually skilled professions, such as engineering or teaching," says James E.
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.
Young brains are capable of forming many new synapses, and they are consequently better at learning new things.
NERVE ENDINGS: The Discovery of the Synapse RICHARD RAPPORT
These cells were known to support the neurons in adults, but had never been fingered as players in forming the connections between neurons, known as synapses.