what factor result in variation? 
dna copying error or
​mutations or both?
​do mutations occur because of dna copying error?
 

Dear student,            
Please find below the solution to the asked query         
                                                   

There are various factors that cause variation such as mutation, events occurring during sexual reproduction; crossing over, independent assortment, errors in replication or DNA copying etc.  

So, both errors in DNA copying and mutations are the factors that result in variations.


The occurrence of an error in DNA copying is natural and is accompanied by mispairings in the bases which leads to the variation and ultimately mutations.   

Hope this information will clear your doubts about the topic.   
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yep mutations occcur due to DNA copying errors and are a prime cause for variations
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