What is the meaning of phenotype could be represented by a number of different genotype
The same function can be described in several ways.
If you're familiar with finite automata, then you should know that the same regular language (&quot;phenotype&quot;) can be represented by many different finite automata (&quot;genotype&quot;).
The same holds in many other cases, unless you choose an encoding which guarantees that every function has a unique description. It is not clear whether this is even desirable. For example, the genetic code has some redundancy which causes the same DNA sequence to encode the same proteins.