Therefore, if the parent is genetically very brittle, so that most of these mutants have a low replication rate or are even lethal, then the overall replication rate of all the organism's offspring will be fairly moderate, even though the organism itself may produce offspring at a rapid
paste. If a different organism produces offspring at a slower
paste, but is more robust towards mutations, so that the majority of this organism's offspring have a replication rate similar to that of their parent, then the overall replication rate of this organism's offspring will be larger than the one of the first organism.