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Conjugation Microbiology powerpoint presentation

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conjugation microbiology powerpoint presentation ppt

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Conjugation Microbiology powerpoint presentation

  1. 1. MICROBIOLOGY CONJUGATION Meghna V III Semester MGMCH
  2. 2. BACTERIAL CONJUGATION WAS FIRST DISCOVERED BY Lederberg And Tatum IN 1946 IN Esch.coliK12 STRAINS
  3. 3. CONJUGATION BACTERIA A BACTERIA B TRANSFER OF GENETIC MATERIAL FROM BACTERIA A TO BACTERIA B BY MATING OR CONTACT IS CALLED CONJUGATION.
  4. 4. WHO IS A DONOR? F PLASMID DONOR F+ MALE CELL ABSENT RECIPIENT F– FEMALE
  5. 5. F PLASMID FERTILITY FACTOR SEX FACTOR TRANSFER FACTOR
  6. 6. THIS F PLASMID ENCODES FOR THE SEX PILUS
  7. 7. WHAT HAPPENS DURING CONJUGATION?
  8. 8. THE ONCE FEMALE RECIPIENT CELL NOW BECOMES THE MALE DONOR CELL THIS CHARACTERISTIC OF MALENESS (F+) IN BACTERIA IS TRANSMISSIBLE OR INFECTIOUS
  9. 9. What is Hfr cell? When F factor/ plasmid exists in an integrated state with the host chromosome
  10. 10. Hfr CONJUGATION
  11. 11. F+ (free plasmid) Hfr ( integrated ) REVERSIBLE TURNS A (F-) INTO A (F+) UPON CONJUGATION CONJUGATION WITH A Hfr , AN (F-) RARELY BECOMES (F+) BUT IT RECEIVES CHROMOSOMAL DNA FROM THE DONOR
  12. 12. REVERSIBLE (F+) Hfr
  13. 13. SEXDUCTION
  14. 14. F+ Hfr REVERSIBLE WHEN THE F FACTOR REVERTS FROM INTEGRATED FREE STATE IT MAY SOMETIMES CARRY WITH IT SOME CHROMOSOMAL DNA FROM ADJACENT SITE OF ITS ATTACHMENT SUCH AN F FACTOR IS KNOWN AS F’ FACTOR
  15. 15. ( F’) + ( F-) SEXDUCTION WHEN (F’) CONJUGATES WITH A RECIPIENT (F), IT TRANSFERS, ALONG WITH THE F FACTOR, THE HOST DNA INCORPORATED WITH IT.
  16. 16. MEDICALLY IMPORTANT FACTORS WHICH CAN BE TRANSFERRED BY CONJUGATION 1. COLICOGENIC FACTOR (COL) 2. RESISTANCE TRANSFER FACTOR (RTF)
  17. 17. THANKYOU

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