While the technology is incredible we ought to be very careful when applying it to DNA not only for moral reasons but also for scientific ones. Considerinting the fact that as DNA is studied more and more it is revealed to be incredibly complex and likely contains many as yet unexplored levels of functionality.

Here is a very general overview

Back in 1953 wen Watson and Cricks first announced the discovery of the now famous double double helix it was believed that th4re was a one to one relationship of genes to inherited characteristics.

Watson and Cricks 1953 abnnouncement
http://www.nature.com/nature/dna50/watsoncrick.pdf



Ii was once gospel that while environmental and lifestyle factors could influence how a genetic trait was expressed no changes were passed on to future generations. I remember thinking how wonderful. Swap out the defective gene for a chronic condition e.g. diabetes, for a good gene. Over time it became evident That it would not be so simple.

What was once referred to a s junk DNA has held some surprises. Study of 'Junk ' or non-coding DNA continues to divulge more and more surprises.


Some Examples:
'Junk DNA' can sense viral infection: Promising tool in the battle between pathogen and host
April 24, 2012
Source: American Friends of Tel Aviv University

Summary:
Non-coding RNA -- molecules that do not translate into proteins -- were once considered unimportant "junk DNA" by researchers. Now researchers have discovered that when infected with a virus, ncRNA gives off signals that indicate the presence of an infectious agent, providing researchers with a new avenue to fight off infections.
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https://www.sciencedaily.com/releases/20...20424142253.htm


Epigenomes
An epigenome consists of a record of the chemical changes to the DNA and histone proteins of an organism; these changes can be passed down to an organism's offspring via transgenerational epigenetic inheritance. Changes to the epigenome can result in changes to the structure of chromatin and changes to the function of the genome.[1]

The epigenome is involved in regulating gene expression, development, tissue differentiation, and suppression of transposable elements. Unlike the underlying genome which is largely static within an individual, the epigenome can be dynamically altered by environmental conditions.[2]
https://en.wikipedia.org/wiki/Epigenome

Darwin's finches and epigenomes:



Darwin's Finches: Answers From Epigenetics
by Jeffrey P. Tomkins, Ph.D. *
Resources › Life Sciences Resources › Genetics

Authentic speciation is a process whereby organisms diversify within the boundaries of their gene pools, and this can result in variants with specific ecological adaptability. While it was once thought that this process was strictly facilitated by DNA sequence variability, Darwin's classic example of speciation in finches now includes a surprisingly strong epigenetic component as well.1

Epigenetic changes involve the addition of chemical tags in an organism's genome without actually changing the genetic code. Both the DNA nucleotides and the proteins that DNA is wrapped around (called histones) can be chemically tagged by different types of controlling molecules that determine how genes are turned on and off. Thus, the epigenetic regulation of the genome can produce differences in traits without actually being related to changes in the DNA sequence itself. What's even more amazing is that these changes can be inherited over multiple generations. Thus, epigenetic changes unexpectedly facilitate variability and speciation within created kinds.

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http://www.icr.org/article/8338/