Why are there mutations in the gene from parents.

How do mutations occur?

  Mistakes in the replication of your DNA. Normal mistakes.  
  Mistakes in your DNA caused by chemicals or your environment.  
     
     

 

 

How do we get our genes form our parents?

  Your genes are transferred form your parents to you by the gametes produced by your parents.  
  Each cell produced by the fertilized egg (zygotes) is identical to the original zygote.