| crossed testicular ectopia | Testis that has crossed the midline to join its contralateral mate in the contralateral inguinal canal or hemiscrotum. (05 Mar 2000) |
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| 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) |
| crossover fixation | <molecular biology> The addition of extra copies of segments of DNA on the same strand by unequal crossing over during meiosis. An explanation for the existence of satellite DNA, which are highly-repeated, non-transcribed sequences of DNA with no clear function. An alternative explanation to saltatory replication. (03 Jul 1999) |
| crossover study | <statistics> A study that compares two or more treatments or interventions in which the subjects or patients, upon completion of the course of one treatment, are switched to another. Usually refers to a study in which the subject is switched from the experimental to the control procedure (or vice versa). In the case of two treatments, a and b, half the subjects are randomly allocated to receive these in the order a, b and half to receive them in the order b, a. A criticism of this design is that effects of the first treatment may carry over into the period when the second is given. With this type of study, every patient serves as his or her own control. (21 Jun 2000) |
| crossway | <physiology> The crossing of two nerve paths. (05 Mar 2000) |
| Crosti, A | <person> 20th century Italian dermatologist. See: Gianotti-Crosti syndrome. (05 Mar 2000) |
| crossbreeding |
(cross
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| crossed |
(crossed) (krost) shaped or arranged like a cross; decussating.
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| crossed diplopia |
double vision in which the image belonging to the right eye is displaced to the left of the image belonging to the left eye, as occurs in exotropia (divergent squint). Called also heteronymous d.
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| crossed extension reflex |
reflex extension of a limb or body part in response to a flexion reflex in the contralateral part.
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| crossed reflex |
a response on the side of the body opposite to the side being stimulated, such as the consensual light reflex or the crossed adductor reflex.
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| CROS | someone who adopts the dress or manner or sexual role of the opposite sex |
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| CROS | (law) close questioning of a hostile witness in a court of law to discredit or throw a new light on the testimony already provided in direct examination |
| CROS | someone who questions a witness carefully (especially about testimony given earlier) |
| CROS | strabismus in which one or both eyes turn inward toward the nose |
| CROS | having convergent strabismus |
| CROS | fertilization by the union of male and female gametes from different individual of the same species |
| CROS | cause to undergo cross-fertilization |
| CROS | undergo cross-fertilization |
| CROS | fertilization by the union of male and female gametes from different individual of the same species |
| CROS | cause to undergo cross-fertilization |
| CROS | undergo cross-fertilization |
| CROS | register as a candidate for several parties |