Curled wing (cu), ebony body colour (e) and sepia eye (se) are three recessive mutations that occur in fruit flies. The loci for these mutations have been mapped and they […]
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CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Drosophila Three‑Point Test Cross
35. In Drosophila order of genes under investigation is as shown in figure. b+ cm+ w+ 5cM 10cM if drosophila with genotype b+ cm+ w+ b cm w is test […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding Gene Order and Map Distances in Drosophila
34. In D. Melanogaster, traits ‘b’ and ‘c’ result from recessive alleles that are located on one of the autosomes. The resulting Fl females were test crossed and the following […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Calculating Genetic Map Distances in Poplar Using Backcross Phenotypic Data
33. Poplar is a dioecious plant. A wild plant with genes AABBCC was crossed with a triple recessive mutant aabbcc. The Fl male hybrid (AaBbCc) was then back crossed with […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Point Test Cross in Drosophila
In Drosophila, Bar eye (B) is a dominant mutation whileminiature wing (m) and yellow body colour (y) arerecessive mutations. eterozygous females for thesemutations were crossed to normal eyed miniaturewinged and […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Calculating Percentage of Double Recombinants in a Three Point Test Cross in Drosophila
31. A three point test cross was carried out in Drosophila melanogaster involving three adjacent genes X, Y and Z. arranged in the same order. The distance between X to […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Genetics of Drosophila Balancer Chromosome TM6B and Sepia Eye Color
30. In Drosophila, balancer chromosomes are used to keep all the alleles on one chromosome together. A balancer contains multiple inversions; so that when it recombines with the corresponding wild […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Additive Nature of Genetic Maps
29. The additive nature of a genetic map as suggested by Alfred Sturtevant and T. H. Morgan is possible if there is: (1) no interference in crossovers. (2) complete interference […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding Coefficient of Coincidence in Three-Point Test Cross
28. Ratio of observed double crossover frequency to the expected frequency of double crossover gamete during three point test cross is termed as- (1) Coefficient of interference (2) Coefficient of […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding the Ratio of Observed to Expected Double Crossovers in Genetics
27. The ratio of observed number of double crossover to expected number of cross over is termed as (1) Coefficient of coincidence (2) Coefficient of interference (3) Hitch hiking (4) […]
