when might it be possible for doctors to correct genetic mutations?

doctors can correct genetic mutations TODAY

example: a child is born with a deficiency for a protein (the gene for it mutated), a plasmid can be shot into tissue using a gene gun and the gene will be expressed

you could also use a lambda phage (a virus body) with the gene inside and it will be expressed

http://en.wikipedia.org/wiki/Gene_therapy

polyploidy is when an entire genome is duplicated in the next generation

this commonly happens when either a cell going through meiosis does cytokinesis (splits) too early, or it can also happen if the DNA that has been duplicated does not sepparate before cytokinesis

http://en.wikipedia.org/wiki/Polyploidy

When you are still growing as an embryo..

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC24449/

http://www.flmnh.ufl.edu/soltislab/trags/New%20Mod...