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| ¿µ¹® | genetic code | ÇÑ±Û | À¯ÀüºÎÈ£ |
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| ICC | immunocompetent cells; immunocytochemistry; Indian childhood cirrhosis; intensive coronary care; int... |
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| 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)... |
| AGA | accelerated growth area; allergic granulomatosis and angiitis; American Gastroenterological Associat... |
| EOI | Emotional Over-Involvement |
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| GAERS | Genetic Absence Epilepsy Rat from Strasbourg |
| GA | Genetic Algorithm |
| GH | Genetic Hemochromatosis |
| GSE | genetic suppressor element |
| 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) |
| 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) |
| genetic | <biology> Pertaining to reproduction or to birth or origin. (07 May 1998) |
| genetic amplification | A process for producing an increase in pertinent genetic material, particularly for increasing the proportion of plasmid DNA to that of bacterial DNA. Includes the production of extrachromosomal copies of the genes for RNA. (05 Mar 2000) |
| genetic assimilation | <genetics> A situation in which a characteristic that is normally expressed only in certain environmental situations becomes fixed in a population so that it no longer requires environmental factors to be expressed. (07 May 1998) |
Synonyms : Crossing Over, Crossing-Over, Genetic, Crossing Overs, Genetic Crossing Over, Genetic Crossing-Over
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