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 […]
Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics
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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) […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
How to Determine Gene Order Using Three-Point Test Cross in Drosophila
26. In an experiment involving mapping of 3 genes (a, b andc) in Drosophila, a three point test cross is carried out.The parental cross was AAbbCCXaaBBcc. The genotypesof the double […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Progeny Proportions in Haploid Organisms
In a haploid organism, the loci A/a and D/d are 8 map units apart. In a cross Ad X aD, what will be the proportion of each of the following […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding Linkage or Independent Assortment from Test Cross
A test cross was made with phenotypically wild type Drosophila files hiving genes for sepia eye and curled wing in heterozygous condition. The following results were obtained: Wild type 400 […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding Recombination in Drosophila melanogaster
23. Which statement is true for Drosophila melanogaster? (1) female are achiasmatic (2) recombination does not occur during male meiosis (3) recombination does not during female meiosis (4) males show […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Calculating Genetic Distance Between Brown Eye and Curled Wing Genes in Drosophila Melanogaster
A cross was made between pure wild type males and brown eyed curled winged females of D. melanogaster. The F1 females were test crossed. The F2 progeny obtained was as […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding Parental and Recombinant Progeny in Linkage Maps
21. In a linkage map, two genes A and B, are 70 CM apart. If individuals heterozygous for both the genes are test crossed number of progeny with parental phenotype […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Maximum Frequency of Recombination Between Two Loci Explained
20. The maximum frequency of recombination that can occur between two loci is (1) 25% (2) 50% (3) 75% (4) 100% The maximum frequency of recombination that can occur between […]
