Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics

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 […]

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 […]

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 […]

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 […]

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: […]

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 […]

28. The following table shows mapping data from three interrupted mating experiments using three different Hfr strains and an F– strain: Appearance of gene in F– cells (Time is represented […]

An interrupted mating experiment was performed between Hfr strs a+b+c+ and F– strr a–b–c– strains. The genotype of majority of streptomycin resistant (strr) exconjugant after 10,20, and 30 minutes of […]

26. The distance between bacterial genes as determined from interrupted mating experiments are measured in units of (1) cM                (2) minutes (3) bp                (4) micrometers The distance between bacterial genes […]