38. A conjugation experiment is carried out between F+ his+ leu+ thr+ pro+ bacteria and F– his– leu– thr– pro– bacteria for a period of 25 minutes. At this time […]
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CSIR NET Life Science Previous Year Questions and Solution on EXTENSION OF MENDELIAN PRINCIPLES (62)
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Interrupted Mating Hfr Mapping Problem
Using interrupted mating, four Hfr strains were analysed for the sequence in which they transmitted a number of different genes to a F- strain. Each Hfr strain was found to […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Hfr Mapping in E. coli
In E. coli four Hfr strains donate the following genet, t markers in the order shown below: Strain 1: L Q W X Y Strain 2: M T A D […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
E. coli Hfr Strains Chromosome Mapping
In E. coli. four Hfr strains donate the genetic markers shown in the order shown: Strain 1: F L K O Z Strain 2: C Y A Z O Strain […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Understanding Gene Order in Bacterial Hfr Conjugation
In a conjugation experiment between bacterial Hfr strain ‘X’ and F-cell, lac gene enters the recipient in 4 minutes, but the F-cells remain auxotrophic for Leu, Trp, Ura, Glu,Phe and […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Hfr Gene Order Mapping
33. A cross is mode between an Hfr strain that is met+ thi+ pur+ and an F– that is met– thi– pur–. The recombinants are selected on medium that contains […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Hfr Conjugation Gene Mapping
32. A cross was made between Hfr met+ arg+ leu+ strs X F– met– arg– leu– strr in which leu+ exconjugants are selected. If the linear organization of the genes […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Interrupted Mating Mapping
31. Two Hfr strains, Hfr-1 (arg+leu+ gal+strS) and Hfr-2 (arg+ his+ gal+ pur+ strs) were mated with a F– strain (arg–leu– gal– his–pur–strs). The results of the interrupted mating experiment […]
![30. Four different Hfr strains of E. coli were mated with F- recipients, and the time of entry of various donor markers were found to be as below: Hfr 1: met [15 min] thr [30 min] phe [42 min] mal [57 min] Hfr 2: bio [50 min] thy [51 min] his [60 min] mal [77 min] Hfr 3: cys [10 min] phe [26 min] his [58 min] Hfr4: his [12 min] bio [22 min] azi [27 min] thi [44min] Based upon the above observations, the following statements were made assuming met to be at 0 min and thr at 15 min: (A) his is located at 59 min (B) azi is located at 74 min (C) cys is located at 11 min (D) mal is located at 76 min Which one of the following options represents all correct statements? (1) A and D only (2) B, C and D (3) A, B and C (4) C and D only](https://www.letstalkacademy.com/wp-content/uploads/2025/12/30-3.png)
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Detailed Explanation of E. coli Hfr Strain Gene Mapping Using Time of Entry Data
30. Four different Hfr strains of E. coli were mated with F– recipients, and the time of entry of various donor markers were found to be as below: Hfr 1: […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Interrupted mating mapping in E. coli
Interrupted mating experiments were performed using three different Hfr strains (1-3). The three strains have different combinations of selectable markers. The time of entry for markers for each strain is […]
