Definitions for "Chiasma"
Related Terms:
Chiasmata, Crossing over, Kinetochore, Centromere, Crossing-over, Metaphase, Homologues, Bivalent, Non-disjunction, Nondisjunction, Anaphase, Chromatids, Homologous chromosomes, Sister chromatid exchange, Reciprocal translocation, Polytene chromosome, Autosome, Synapsis, Uniparental disomy, Robertsonian translocation, Mitotic spindle, Sister chromatids, Chromatid, Prophase, Monosomic, Disjunction, Haploid, Autosomes, Prometaphase, Chromosomal translocation, Acrocentric chromosome, Homologous chromosome, Spindle, Diploid, Meiosis, Telophase, Autosomal, Autopolyploid, Translocation, Y-chromosome, Barr body, Acrocentric, Disomy, Monosomy, Trisomy, Mitosis, Reduction division, Spindle fibers, Tetrad, Synaptonemal complex
A commissure; an intersection or crossing of two tracts; especially, the optic commissure, or crucial union of the optic nerves.
The points of physical overlap of nonsister chromatids crossing-over in meiosis.
a crossing; especially the crossing of the optic (II) nerve fibers
Gr. 'crossing'. Refers mainly to the optic chiasma (chiasm) ( Ch. 2).
The point (literally, a cross) at which a genetic recombination event has occurred, visible as a cross-over in meiotic prophase.
Greek kiasma = cross. (The Greek letter chi = c).
(Greek, = cross; plural, chiasmata) The sites of exchange of DNA between homologous chromosomes during meiosis; visible during prophase of meiosis I.(More? Week 1 Notes)
an intersection or crossing of two tracts in the form of the letter X
Gr. chiasma, two crossing lines. Optic chiasma is the site of crossing of optic nerve fibers to form the optic tract.
Crossing over events at meiosis, resulting in gene recombination.
chiasmata) A cross-shaped structure commonly observed between nonsister chromatids in meiosis; the site of crossing-over.
The site where the exchange of chromosome segments between homologous chromosomes takes place ( crossing-over) (pl.: chiasmata). PICTURE
The ‘crossing-over' point between chromosomes. During the production of sex cells, such as sperm and eggs, these crossing-over points are the places where sections of maternal and paternal chromosomes are swapped. At the chiasmata (pl.) the chromosomes are cut, ends are swapped and new hybrid chromosomes rejoin. This makes new combinations of pre-existing genes in the offspring produced by sexual reproduction.
a crossing of fibers in the form of an X. Used primarily to describe nerve fibers.
A cross-over between strands of two non-sister chromatids during recombination. The junction where two homologous chromosomes appear to exchange genetic material during recombination. (Chi is the greek letter c which resembles a genetic cross-over.)
chiasmata, plural represents a point where non-sister chromatids exchanged genetic material during pachynema
A chiasma (Greek χίασμα, related to the Greek letter Χ) means "crossing." In anatomy, it refers to the point where two (or more) nerves or ligaments cross or intersect. In genetics, it is a technical term for the point where two chromatids are intertwined (interwoven) in a cell.