This week British scientists announced the creation of an embryo with genes from three parents. While most of the genes are from two of the parents, genes from a second mother were inserted. This was done to prevent a possible genetic defect from being passed on by the primary mother.

Curing genetic defects is a short step from outright enhancement. While we are not there, we probably will be within this century. With our increasing knowledge of which genes are responsible for what, I could see a future where parents create their child by selecting characteristics from a gene library. Limiting gene selection to two people would limit choices about the child’s characteristics. Future genetically engineered children could have genes from thousands of parents, or even have genes that are completely artificial.