If you suffer from certain genetic illnesses, or carry a gene for that illness, scientists can take one or two cells to check for those genes and transfer only healthy embryos.
Illnesses can't be transferred from parent to child
( z1 possible :polarity - :ARG1 ( z2 transfer :ARG1 ( z3 ill ) :ARG2 ( z4 child ) :ARG3 ( z5 person :ARG0-of ( z6 have-rel-role :ARG2 ( z7 parent ) ) ) ) )