Depending on the title, there may be more or fewer duties required for the position. While smaller offices may have office assistants perform the duties of secretaries or file clerks, larger offices might have their assistants stick to one duty, such as filing.
Updated August 03, 2017. DNA mutations happen when there are changes in the nucleotide sequence that makes up the strand of DNA. This can be caused by random mistakes in DNA replication or even an environmental influence like UV rays or chemicals.
Other genetic mutations occur due to damage caused to the DNA sequences by lifestyle or environmental factors. Our cells have built in mechanisms that catch and repair most of the changes that occur during DNA replication or from environmental damage.ow Do Genetic Mutations Occur. 03 May, 2011 how do 0. A mutation is a permanent change in the DNA sequence of a gene. Genetic mutations are those that are passed on from a parent to a child and through families or are acquired during a personâs lifetime.