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Q banding: a chromosomal staining technique using the fluorescence dye quinacrin mustard; under UV light a characteristic light and dark banding
is induced cyto meth
QTL >>> quantitative trait locus
quadriduplex type >>> autotetraploid >>> nulliplex type
quadrivalent: a chromosome association of four members cyto >>> Figure 15
quadruplex type >>> autotetraploid
qualitative character: a character in which variation is discontinuous gene >>> Table 33
qualitative inheritance:
an inheritance of a character that differs markedly in its expression amongst individuals of a species; variation is discontinuous; such characters are usually under the control of major genes gene >>> Table 33
qualitative resistance >>> vertical resistance
quality-declared seed: a terminology introduced by the FAO, for a seed system in which a proposed 10 % of the seed produced and distributed is
checked by an autonomous seed control agency and the rest by the seed-producing organization seed
quantitative character: a character in which variation is continuous so that classification into discrete categories is arbitrary gene >>> metric character >>> Table 33
quantitative genetics: a branch of genetics that deals with the inheritance of quantitative traits; sometimes it is also called biometrical or
statistical genetics gene
quantitative inheritance:
an inheritance of a character that depends upon the cumulative action of many genes, each of which produces only a small effect; the character shows continuous variation (i.e., a gradation from one extreme to the other) gene >>> Table 33
quantitative resistance >>> horizontal resistance
quantitative trait locus (QTL): a locus or DNA segment that carries more genes coding for an agronomic or other traits gene >>>
Table 33
quantitative vertical resistance: a rare type of resistance; it occurs cereals, e.g., Hessian fly resistance (Mayetiola destructor) in
wheat or rice blast; it is a confusing term because its inheritance is qualitative while its effects are quantitative; it can easily be confused with horizontal resistance, and the best way to avoid it in a
breeding program is by choosing only parents that exhibit the normal, qualitative, vertical resistance phyt >>> quantitative resistance >>> horizontal resistance
quantum speciation:
the rapid rise of a new species, usually in small isolates, with the “founder effect” and random genetic drift; it is also called saltational speciation tax evol
quarantine:
the official confinement of plants subject to phytosanitary regulations for observation and research or for further inspection and/or testing; more general, a legal ban on the export or import of certain noxious weeds or insects that may be attached to the plants meth seed agr
quarternary hybrid: a hybrid derived from four different grandparental individuals meth
quartet: the four nuclei and/or cells produced during meiosis bot >>> tetrad
quasi-complete Latin square - quasivollständiges lateinische Quadrat n:
a Latin square because every entry appears once in each row and once in each column; it is quasi-complete because every entry is a horizontal neighbor to every other entry exactly twice, and every entry is a vertical neighbor to every other letter exactly twice stat >>> Figure 90
quelling: post-transcriptional gene silencing in Neurospora crassa induced by the introduction of a transgene biot >>> PTGS
quereitron >>> glucoside
quick test (of seed testing): a type of test for evaluating seed quality, usually germination, more rapidly than standard laboratory tests seed
quiescence >>> dormancy
quincuncial: of the arrangement of corolla lobes in a bud; a variant of imbricate aestivation bot
quincunx planting: planting four young plants to form the corners of a square with a fifth plant at its center meth
quinone >>> growth inhibitor
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