Question

What do you mean by selective media?

Answer 1

Explanation:

Selective and Differential Foods?

I bet that every one of us knows someone who is allergic to peanuts. Standing in a crowded room, it would be impossible to identify the individuals with this allergy simply by looking at them - assuming no one is wearing a medical alert bracelet.

But what if we really wanted to know who was allergic to peanuts and who was not? What could we do?

One option, and I'm not suggesting you try this at home, would be to give everyone in the room a cookie laced with peanuts. Very quickly, the allergic people in the room would start showing symptoms. They might start having trouble breathing, swell up or start vomiting. In any case, it would be very easy to differentiate the mixed population into allergic and non-allergic groups. The peanuts would serve as a differential food.

Let's take this a little further. Now that you know who is allergic to peanuts, suppose you want to encourage the survival of peanut-resistant people while inhibiting the survival of the peanut-allergic. All you would have to do is provide these people only peanut-based foods. People that could eat peanuts would be fine. People that could not would either starve or die of an allergic reaction. You have just selected for the peanut-resistant people. Here, the peanuts would serve as a selective food.

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