please help me with this genetics question im lost and have read the chapter 3x?

This is a nice fun question! But I will assume that the 105 should be 10exp5 (100,000) and the 108 should be 10exp8. Otherwise it does not make a lot of sense.


a. That would be 2/100000 = 2 * 10exp-5
b. In every cycle, the number of genes is doubled. So after 1 cycle you have 2x the number of amplicons, after 2 cycles you have 4x, after 3 cycles you have 8, etc. It grows by the power of 2 (2n). After 10 cycles you have 2 to the power of 10 = 1024 copies of that gene. Now the ratio is 2048/100000 =  0.02048 (remember that the size is 2 kb). After 25 cycles you have 2^25 = 33 554 432 copies, so now you have 67108864/100000=671, so almost 700 x more than the total DNA!