T4 phages were plated on three E. coli bacterial plateslabelled I,II and III. The phenotypes obtained aredepicted in the picture below. The black spotsrepresent plaques. The following combination of conditions […]
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CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Complementation and recombination of rII mutants a– and b– in T4 phage
22. Wild type T4 bacteriophage can grow on Band K strains of E. coli forming small plaques. rll mutants of T4bacteriophage cannot grow on E. coli strain K (non- permissive […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
How linkage is broken during prophase in Drosophila
21. upon studying a considerable number of different crosses in Drosophila, Morgan reached the conclusion that all genes of this fly were clustered into four linked groups corresponding to the […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Benzer’s recon concept from T4 rII lysis mutants
20. The concept of recon was proposed by Seymour Benzerby studying recombination between (1) lysis mutants of bacteriophage T4 (2) white eye mutants of Drosophila melanogaster. (3) biochemical mutants of […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
How many complementation groups do mutants m1–m6 form?
How many complementation groups do the following mutants m1 to m6 come under? Result of complementary between different mutants m1 m2 m3 m4 m5 m6 m1 – – + […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Interpreting a complementation test matrix to find cistrons
The results of a complementation test for five independent mutants (1 to 6) are summarized below 1 2 3 4 5 6 0 + 0 + + 0 1 […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Interpreting complementation test matrix to count cistrons
The results of a complementation test for five independent mutants (1 to 5) are summarized below: 1 2 3 4 5 0 0 0 + + 1 0 […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Determining the number of complementation groups from mutant crosses
16. Four different mutant lines showing similar phenotype were identified from a genetic screen. When genetic crosses among these mutants were carried out, the first mutant was found to complement […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Interpretation of wild-type progeny from crossing two mutants with the same phenotype
15. When two mutants having the same phenotype were crossed, the progeny obtained showed a wild-type phenotype. Thus the mutations are (1) non-allelic. (2) allelic. (3) segregating from each other. […]
CSIR NET Life Science Previous Year Questions and Solution on CONCEPTS OF GENE
Why light‑red and dark‑brown eye mutants give wild‑type F₁ in Drosophila
14. Two mutants of Drosophila melanogaster. one showing light red eye colour and the other showing dark brown eye colour, were crossed. In F1 all flies showed normal red eye […]
