Crossing

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
Fertilization of an organism from an other organism with a different genetic constitution. Cf. Selfing.
Segregation ...
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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 exchange of DNA sequences between chromatids of homologous chromosomes during meiosis.
Culture. A particular kind of organism growing in a laboratory medium.
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crossing-over During the first meiotic prophase, the process in which part of a chromatid is physically exchanged with another chromatid to form chromosomes with new allele combinations. PICTURE ...
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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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Crossing-over
(
recombination
): The exchange of genetic material between non-sister chromatids of homologous chromosomes (i.e., between maternal and paternal chromosomes) during meiosis.
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crossing-over The exchange of material between homologous chromosomes, during the first meiotic division, resulting in a new combination of genes.
crown The topmost portion of a plant.
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The crossing of an organism, with an unkown genotype, to a homozygous recessive organism (tester). A cross between an individual of unknown genotype or a heterozygote (or a multiple heterozygote) to a homozygous recessive individual.
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Mendel's crossing of plants differing in two characters is an example of a dihybrid cross.
Another view of law of independent assortment.
Some characters do not assort independently. They are called linked characters.
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The first crossing of a major ocean to Australia was probably 40-50,000 years ago and many of these other features are found in the people there. So I think there's another puzzle, which is what is called the "emergence of modern humans.
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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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Crossing an organism with one of its parent organisms. Bacteriocide. A class of antibiotics that kills bacterial cells. Bacteriophage (phage or phage particle). A virus that in- fects bacteria. Altered forms are used as vectors for cloning DNA.
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Typically, the hybrid zone will include representatives of one or both of the 'pure' populations, plus first-generation and back-crossing hybrids.
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The process will often be greatly retarded by free intercrossing. Many will exclaim that these several causes are amply sufficient wholly to stop the action of natural selection. I do not believe so.
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For example, crossing between parental Aa Bb and aa bb can have offsprings with the following non-parental genotypes: Aa bb or aa Bb. Recombinants are results of chromosome cross-over 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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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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