A shotgun genome sequencing project is designed in which the average length of a sequenced fragment is 150 nucleotides and each nucleotide is to be sequenced an average of 20 times. For a genome that is 3 × 107 base pairs long, how many fragments of 150 nucleotides would need to be sequenced?
A)(3 × 107)× 20 × 150 = 9 × 1010
B)(3 × 107)× 150 ÷ 20 = 2.25 × 108
C)(3 × 107)÷ (20 × 150)= 1 × 104
D)(3 × 107)× 20 ÷ 150 = 4 × 106