The best explanation as to why Kai is not identical to her parents is because their DNA is made of different codon sequences.
When it comes to expressing genes, the information on organisms' DNA sequence is first transcribed as codes into an mRNA. The coded information is then translated as proteins in a process known as protein synthesis.
Thus, for two organisms to be identical, the information on their DNA must be exactly the same. In other words, the codon sequence on their DNAs must be the same. Once there is a variation, different messages would be translated and this will tell as variations on the physical appearances of the organisms.
More on gene expression can be found here: https://brainly.com/question/19883692
