Impact of biotechnological applications on gene pool, Biology

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Human disorders are increasingly being diagnosed and treated using biotechnological applications such as:

Genetic testing, containing testing of adults by to pre-birth diagnosis (for example: pre-implantation genetic diagnosis (PIGD) of embryos, amniocentesis or chorionic villus testing)
Gene therapy
Stem cell research
Xeno-transplantation.

Question

Discuss how the use of named biotechnological applications may impact on the gene pool and the future biological evolution of Homo sapiens.

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