Crossing over

crossing over
the exchange of genetic material between members of a homologous chromosome pair
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
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Crossing Over and Genetic Recombination in Meiosis
Crossing over occurs between equivalent portions of two nonsister chromatids.
Link to an illustrated discussion of crossing over examined at the level of a cell undergoing meiosis.
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Crossing over is more likely to occur between genes that are far apart. The farther apart genes are, the greater the probability that crossing over will occur between them.
In the example above, we had 8% crossing over.
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Crossing over
Main article: Chromosomal crossover
Crossing over of two chromosomes occurs during meiosis. After chromosomal replication, the four available chromatids are in tight formation with one another.
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Crossing over
Main article: Chromosomal crossover
Crossing over of one of the chromosomes inherited from each of one's parents occurs during meiosis in that parent.
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crossing over: Where a section of one chromosome switches places with the same section from the other chromosome of the pair. This sometimes occurs when a germ cell makes copies of its chromosomes before dividing.
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crossing over: a process during prophase I in which segments of DNA from one chromatid in the tetrad pass to another chromatid in the tetrad.
cyanobacteria: see blue-green algae.
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crossing over
the reciprocal exchange of genetic material between non-sister chromatids during synapsis of meiosis I.
Crustacea
class in the phylum Arthropoda. Most members of this class are aquatic, although a few are terrestrial.
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crossing over
The reciprocal exchange of genetic material between nonsister chromatids during synapsis of meiosis I.
cryptic coloration ...
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Crossing over: The breaking during meiosis of one maternal and one paternal chromosome, the exchange of corresponding sections of DNA, and the rejoining of the chromosomes. This process can result in an exchange of alleles between chromosomes.
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Related Terms: Crossing over
The term coined by Morgan and Cattell (1912) for the occurrence of new combinations of linked characters.
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The exchange of DNA fragments between two DNA molecules or chromatids of paired chromosomes (during crossing over) at the site of identical nucleotide sequences. Homozygote.
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Animation of meiosis illustrates the integration of replication, crossing over and segregation. A series of diagrams assists in understanding meiosis.
Photomicrographs and drawings of mitosis are also helpful.
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May-Thurner syndrome is compression of the left iliac vein by the artery crossing over it. This is normal anatomy, but in some people the artery presses on the vein enough to thicken the vein wall over time.
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Events of Prophase I (save for synapsis and crossing over) are similar to those in Prophase of mitosis: chromatin condenses into chromosomes, the nucleolus dissolves, nuclear membrane is disassembled, and the spindle apparatus forms.
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An X-shaped crossing formed by the crossing over of homologous chromosomes during meiosis when genetic material is exchanged.
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But having invented SRY the key driver of the evolution of the sex chromosomes was the shutting down of recombination of crossing over between this pair.
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Recombination frequency. The frequency at which crossing over occurs between two chromosomal loci--the probability that two loci will become unlinked during meiosis.
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The exchange of pieces of DNA during the formation of eggs and sperm. Recombination allows the chromosomes to shuffle their genetic material, increasing the potential of genetic diversity. Homologous recombination is also known as crossing over.
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where pairs of homologous chromatids remain in contact during late prophase to anaphase of the first meiotic division. The chiasma indicates where an exchange of homologous segments has taken place between nonsister chromatids by crossing over.
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This process is the molecular basis of crossing over during meiosis and some DNA repair mechanisms. Another form of recombination, site-specific recombination, is found where transfer, rearrangement or insertion of specific sections of DNA occurs e.
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