E.coli with minimal media problem, HELP

  • Thread starter Intr3pid
  • Start date
In summary, the conversation discusses a problem involving determining gene order using a classical genetics approach. The solution involves drawing a map of all possible gene orders and predicting recombination and phenotypes. The example given involves a donor DNA with 5 compounds and a recipient DNA with colonies. The likelihood of unique, double, triple, and quadruple cross-over is also discussed.
  • #1
Intr3pid
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Homework Statement


in the picture/attached file



Homework Equations


no equations necessary


The Attempt at a Solution


don't know how to start it off. I know the E.coli strain can't make the 5 compounds and the colonies present indicate which gene it's missing but I don't know how to determine the gene order from the data.

can someone give me a hint, please?

thanks
 
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  • #2
Can you post the a link to the picture or explained the data?

The attached file is not present.
 
  • #3
sorry about that, here's the file.
 

Attachments

  • mininal media question.GIF
    mininal media question.GIF
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  • #4
That's classical way to do genetics.

The solution is based on recombination and the chance of unique, double, triple, quadruple, etc, cross-over to occur. In that problem you'll have to assume that only double cross-over occurred. Triple and quadruple are very unlikely and single would destroy the chromosome.

So to start it up, you need to draw a map of all possible gene order (painful task) and look at all the possible location for cross-over and predict the possible recombinant and phenotype.

For example

Donor DNA___A______B______C_________D________E_____
Cross-over_1______2_____3_______4_________5_______6
Recipent____a_______b______c________d_________e______

Possible recombination ABCDE, aBCDE, Abcde, etc

Phenotype: doesn't need any compound, need compound a, need compound bcde, etc

Since all your plate have three amino acid added, you only have to look at recombination that exclude 3 genes / fix two genes.
 
Last edited:

What is E.coli with minimal media problem?

E.coli with minimal media problem refers to a situation where E.coli bacteria are unable to grow or survive in a minimal media environment, which is a culture medium with the bare minimum nutrients and essential compounds for bacterial growth. This problem can occur due to various factors such as genetic mutations, nutrient deficiencies, or environmental stress.

What are the symptoms of E.coli with minimal media problem?

The symptoms may vary depending on the specific cause of the problem, but common signs include slow or no growth of E.coli bacteria in minimal media, reduced cell viability, and abnormal cell morphology.

What are the possible causes of E.coli with minimal media problem?

There can be several causes of E.coli with minimal media problem, such as mutations in genes responsible for nutrient uptake and utilization, lack of essential nutrients in the media, or exposure to inhibitory compounds in the environment.

How can E.coli with minimal media problem be prevented?

The best way to prevent this problem is to ensure that the minimal media used for culturing E.coli has all the necessary nutrients and compounds in optimal concentrations. Regularly checking the media for any contamination and maintaining proper culturing conditions can also help prevent this problem.

How can E.coli with minimal media problem be solved?

If the problem has already occurred, it can be solved by identifying and addressing the underlying cause. This may involve optimizing the media composition, adding specific nutrients or supplements, or genetically modifying the bacteria to improve their ability to grow in minimal media.

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