| ICC | immunocompetent cells; immunocytochemistry; Indian childhood cirrhosis; intensive coronary care; int... |
|---|---|
| SCO | sclerocystic ovary; somatic crossing-over; subcommissural organ |
| CEA | Carcino-Embryonic Antigen [HP 1825-6] ; Oncofetal Antigens ; Glycopro... |
| OD | 1) Doctor of Optometry 2) Oculus Dexter; Right Eye; ¿ìÃø´« 3)... |
| CO | carbon monoxide; cardiac output; castor oil; casualty officer; centric occlusion; cervical orthosis;... |
| EOI | Emotional Over-Involvement |
|---|---|
| NOESY | Nuclear Over-hauser enhancement spectroscopy |
| OTC | Over The Counter |
| ROPS | Roll-over protective structures |
| ROT | Roll-over test |
| crossing over | <genetics, molecular biology> The breaking during meiosis of one maternal and one paternal chromosome, the reciprocal exchange of corresponding sections of DNA along pairs of homologous chromosomes by symmetrical breakage and crosswise rejoining of the chromosomes. This results in the transfer of a block of genes from each chromosome to its homologue. In contrast to genetic recombination, which is a phenotypic phenomenon, crossing-over is genotypic. Any even number of crossing-overs between two loci will cancel out phenotypically and no recombination will occur. Recombination can result from DNA exchange of alleles between between homologous chromatids in meiosis, giving rise to chiasmata. Compare: recombination. (10 Nov 1998) |
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| somatic crossing-over | Crossing-over that occurs during the mitosis of somatic cells, in contrast to that which occurs in meiosis. (05 Mar 2000) |
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| unequal crossing over | <cell biology> Crossing over between homologous chromosomes that are not precisely paired, resulting in nonreciprocal exchange of material and chromosomes of unequal length. Favoured in regions containing tandemly repeated sequences. (18 Nov 1997) |
| uneven crossing-over | Unequal crossing-over, crossing-over that happens when the breaks do not occur at precisely homologous points in two chromatid strands, and hence results in localised duplication of genetic material in one chromatid and complementary deletion in the other. (05 Mar 2000) |
| four-strand crossing over | Crossing over with both strands of DNA from each sister chromatid, so that both strands from one chromatid are exchanged for both strands on the other. This is different from the usual case where only one of the two DNA strands on one sister chromatid is exchanged for the one matching strand (of the two strands) on the other sister chromatid. (09 Oct 1997) |
| Gunn's crossing sign | <clinical sign> Retinal arteriovenous crossing with venous compression in hypertensive disease. (05 Mar 2000) |
| aged, 80 and over | A person 80 years of age and older. (12 Dec 1998) |
| maternal age 35 and over | Pregnancy in women 35 or more years of age. It is used for normal pregnancies and for problems of pregnancy occurring in a woman's late reproductive years. These include effects on the mother's physical and mental health as well as risks of perinatal mortality and foetal abnormality. (12 Dec 1998) |
| drug, over-the-counter | Drug for which a prescription is not needed. (12 Dec 1998) |
| tie-over dressing | A dressing placed over a skin graft or other sutured wound and tied on by the sutures which have been left of sufficient length for that purpose. Synonym: bolus dressing. (05 Mar 2000) |
| flip-over disease | <disease> A disease of young, fast-growing broiler chickens which causes them to die suddenly with a short, terminal, wing-beating convulsion, whereby they often flip over and die on their backs. (05 Mar 2000) |
| flow-over vaporiser | A device for vaporization of a liquid anaesthetic by causing gases to pass over the anaesthetic or over material saturated with the anaesthetic. (05 Mar 2000) |
Synonyms : Crossing Over, Crossing-Over, Genetic, Crossing Overs, Genetic Crossing Over, Genetic Crossing-Over
| crossing over |
the interchange of sections between pairing homologous chromosomes during the prophase of meiosis
Ãâó: wordnet.princeton.edu/perl/webwn
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| crossing over |
(cross·ing over) (kros¢ing o¢v[schwa]r) the exchanging of genetic material between nonsister chromatids of the paired homologous chromosomes during the pachytene stage of the first meiotic division, resulting in new combinations of genes; called also chiasmatypy.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| crossing over |
Chromosomal crossover is the process by which two chromosomes, paired up during Prophase I of meiosis, exchange some distal portion of their DNA. Crossover occurs when two chromosomes, normally two homologous instances of the same chromosome, break and then reconnect but to the different end piece. If they break at the same place or locus in the sequence of base pairs, the result is an exchange of genes. This outcome is the normal way for crossover to occur. ...
Ãâó: en.wikipedia.org/wiki/Crossing_over
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| crossing over |
互換, 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. Compare recombination.
Ãâó: www.geocities.com/bioinfoweb/glossary/glossary.htm...
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| crossing over |
The exchange of DNA between chromosomes during meiosis.
Ãâó: highered.mcgraw-hill.com/sites/0767430220/student_...
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| crossing over | the interchange of sections between pairing homologous chromosomes during the prophase of meiosis |
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