First Step "Replication"

In this step we will begin with our 4 nucleotides "ACGT"

nucleotide= list('ACGT')

This will create a list with 4 nucleotids that we will manipulate

To use the random generator we must call the random module in the beginning of the source code:

• import random

Then we will form our 5' ADN branch randomly generated
for i in range(330): # randomly choosed 330 nucleotides

• x=random.choice(nucleotide)  
• ADN_5.append(x)

Now we will form the 3'ADN branch according to the 5' like this complementarity table:

• A -> T
• T -> A
• C -> G
• G -> C

The code source should look like this:

• for i in range(len(ADN_5)):
• if ADN_5[i]=="A":
• ADN_3.append("T")
• elif ADN_5[i]=="T":
• ADN_3.append("A")
• elif ADN_5[i]=="C":
• ADN_3.append("G")
• elif ADN_5[i]=="G":
• ADN_3.append("C")

 this loop will test each nucleotid in the ADN_5 branch tand assign to ADN_3 branch the right nucleotid according to the complementarity table.
The result look like this in the pytho shell:

With this part of code we have formed our entire ADN portion that we will work in the next phase: The Transcription