E. coli strain B is doubly infected with two rII mutants of phage T4. 0.2 ml of a 108 dilution of the progeny is plated on E. coli B and 0.1 ml of a 104 dilution of the progeny is plated on E. coli K. 16 plaques appeared on strain B, 400 on strain K. Calculate the recombination frequency between these two mutations.

Given:

The formula:

→

By putting the values in the above formula, we get

→        

→        

→        

Thus the solution above is the right approach.

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To Find :

The recombination frequency between these two mutations.

Solution :

Formula of calculating recombination frequency is :

Putting all given values in above equation, we get :

Therefore, the recombination frequency between these two mutations is 0.01 or 1 %.

hey there!

so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

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tobey