The human genome contains about 4 billion base pairs of DNA. Each base pair is one of four nucleotides, commonly labelled as A, T, G or C.
a) Estimate the total number of possible genomes of length 4 billion, and enter the number of digits it has (e.g. if it's 329103809212 enter 12)
b) The genome is divided into about 20,000 genes. How many ways can you divide 4 billion base pairs into 20,000 genes? Again, enter the number of digits.