Category: Genetics and Plant Breeding Definitions A to Z
G – Genetics and Plant Breeding definitions
By Agritests |
27 Jun, 2026
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G banding: A special staining technique for chromosomes that results in alongitudinal differentiation by Giemsa stain, which is a complex of stains specificfor the phosphate groups of DNA; the characteristic bands produced are calledG bands; these bands are generally produced in AT-rich heterochromatic regions Gain-of-Function Mutation. A mutation that results in a new functional ability for aprotein, […]
F – Genetics and Plant Breeding definitions
By Agritests |
27 Jun, 2026
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F2. The second filial generation obtained by self-fertilization or crossings inter se of F1individuals. F3. The third filial generation progeny obtained by self-fertilizing F2 individuals. Facilitated recurrent selection: A type of recurrent selection in which geneticmale sterility is maintained in the population to maintain heterozygosity andgenetic diversity and to permit the recombination and shifting of gene frequencies Factor. A genetic determinant […]
E – Genetics and Plant Breeding Definitions
By Agritests |
27 Jun, 2026
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E. coli. The Escherichia coli; easily cultured prokaryotic organism. The bacterium is thusfar most studied and best understood. Early generation test: Selection schemes in which poor recombinants are discarded already in F2 and F3 generations Early Generation Testing. Also called early testing; the evaluation of breeding materialsfor specific characteristics during early segregating generations (F2, F3, and F4) basedon certain parameters. Early testing […]
D – Genetics and Plant Breeding definitions
By Agritests |
27 Jun, 2026
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D2-Statistic (Mahalanobis 1928). A statistic used to determine the degree of divergenceamong populations/ breeding lines/ genotypes in terms of generalized group distance.Numerically, it is the sum of squares of differences between any two-populations/genotypes for each of the uncorrelated variables/traits. (Correlated variables aretransformed to uncorrelated ones by pivotal condensation method). It is useful inPlant Breeding as it facilitates in […]
C – Genetics and Plant Breeding definitions
By Agritests |
27 Jun, 2026
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C 306. A tall wheat variety developed through a complex cross in 1965. This variety stillcontinues to be dominant wheat for drought (soil moisture stress) and low-fertilityconditions in some parts of the plains of India. C banding: A cytological staining technique for chromosomes that labelsregions around the centromere with Giemsa stain; usually a bandlike and darklystained structure […]
B – Genetics and Plant Breeding definitions
By Agritests |
27 Jun, 2026
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B chromosome: Any chromosome of a heterogeneous group of chromosomespresent in several plant species, which differ in their morphology, numericalvariation, meiotic pairing, and mitotic behavior from normal A chromosomes; theyare also called supernumerary chromosomes, accessory chromosomes, or extrachromosomes; a B chromosome derives from the A chromosome complement byaberrant division processes and subsequent modifications B line: The fertile […]