3,000,000,000 base pairs
10,000 genes
10,000 base pairs per gene
1) number of base pairs are in all the mammalian =
= number base pares in each gene*number of genes
=10,000 *10,000=1,000,000,000
2) 1,000,000,000 is 1/3 of 3,000,000,000
because 1,000,000,000/3,000,000,000 = 1/3
which is about 0.33
which is the same as 33/100
which means it is 33%
3) A random mutation has 33% probability to occur in a
gene (the same as the proportion bp gene/bp genome as asked in 2))
4) You have to multiply both probabilities: 1/3*1/3=1/9 = 0.11 = 11/100 = 11%
