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Announcements. Ch. 8 Part 2 Homework due today Ch. 8 Part 3 Homework due Friday Online quiz due at midnight TONIGHT Lab tomorrow at 8 AM Review Session: Tuesday March 4 th at 9 AM and 10 AM…Bring muddiest points. Bacterial Genetics Chapter 8 Part 3. Recap (2 Minutes).

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Announcements
Announcements

  • Ch. 8 Part 2 Homework due today

  • Ch. 8 Part 3 Homework due Friday

  • Online quiz due at midnight TONIGHT

  • Lab tomorrow at 8 AM

  • Review Session: Tuesday March 4th at 9 AM and 10 AM…Bring muddiest points


Bacterial genetics chapter 8 part 3

Bacterial GeneticsChapter 8 Part 3


Recap 2 minutes
Recap (2 Minutes)

What are the mechanisms by which bacteria can acquire new genes?

Answer:

DNA-mediated transformation

Transduction

Conjugation


Revisiting plasmids
Revisiting Plasmids

  • Common to bacteria

  • Double stranded DNA

  • They have ori

  • Do not code information critical to a cell’s life

  • Do provide an advantage for certain environments

  • Vary in amount of genes they carry: few to many

  • Narrow host range

  • Transferred by conjugation

  • Resistance plasmid-encode resistance to many antibiotics


Horizontal gene transfer chromosome transfer
Horizontal Gene Transfer: Chromosome Transfer

  • Less common than plasmid transfer

  • Involves Hfr cells: High frequency recombination

  • The plasmid integrates into the chromosome

  • So, part of the chromosome ends up getting transferred to the F- cell



Chromosome transfer
Chromosome Transfer


Revisiting transposons
Revisiting Transposons

  • They can disrupt genes

  • They can also transfer genes from one bacteria to another

  • 2 types: insertion sequence and composite sequence




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