Bacterial colonies in DNA cloning?

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    Cloning Dna
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Discussion Overview

The discussion revolves around the process of bacterial colony formation in the context of DNA cloning, specifically how identical bacteria can form separate colonies when plasmids containing different DNA fragments are introduced. The scope includes conceptual understanding of bacterial growth and colony isolation techniques.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions how identical bacteria can grow into separate colonies after being introduced to different plasmids containing distinct DNA fragments.
  • Another participant explains that isolating bacterial colonies involves diluting bacteria to a low concentration and spreading them on a petri dish, allowing individual cells to grow into separate colonies.
  • A follow-up question seeks clarification on whether multiple colonies can contain the same plasmid after dilution, suggesting a potential for multiple colonies with plasmid A or B.
  • A later reply confirms that the number of colonies with a specific plasmid corresponds to the number of bacteria that successfully took up that plasmid.

Areas of Agreement / Disagreement

Participants generally agree on the process of colony formation and the relationship between plasmid uptake and colony number, but there is an initial uncertainty regarding the implications of identical starting bacteria leading to separate colonies.

Contextual Notes

The discussion does not address specific conditions or limitations that may affect bacterial growth or plasmid uptake, nor does it explore the mechanisms behind plasmid incorporation in detail.

Who May Find This Useful

This discussion may be useful for individuals interested in microbiology, genetic engineering, or laboratory techniques related to DNA cloning and bacterial culture.

sameeralord
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If there is some identical bacteria in petri dish and you insert plasmids containing different DNA fragemnts. When bacteria that takes it up grows, do they grow in separate colonies. I mean does all bacteria that took plasmid A grow into one colony, and all bacteria that got plasmid B into one colony. But at the beginning all the bacteria was identical so why do they grow into separate colonies. Basically in other words I don't understand how bacterial colonies work. Thanks :smile:
 
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The way you isolate bacterial colonies is by diluting the bacteria down to a low concentration and then spreading them out on a petri dish. This way, individual bacterial cells are spread out throughout the petri dish and relatively far away from their neighbors. As the bacteria divide, the progeny of each individual bacteria are spatially separated from each other and form colonies on the plate.
 
Ygggdrasil said:
The way you isolate bacterial colonies is by diluting the bacteria down to a low concentration and then spreading them out on a petri dish. This way, individual bacterial cells are spread out throughout the petri dish and relatively far away from their neighbors. As the bacteria divide, the progeny of each individual bacteria are spatially separated from each other and form colonies on the plate.

Thanks :smile: Does this mean, let's say some bacteria took plasmid A and some took plasmid B. Then dilute as you said. Then can there be like 2 or more colonies contaning plasmid A or B.
 
Yes. The number of colonies with the plasmid will reflect the number of bacteria that took up the plasmid.
 

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