Answer from: Maria José Mendiola, MD, MSc in Human Genetics, MSc in Science Communication, ObGyn
Answer from: Douglas Lester, PhD, MSc, BSc (Hons)
Pre-implantation diagnosis of the embryo checks presence of 2 X chromosomes and the absence of Y chromosome for implantation, guarantee the birth of an unaffected fertile female. Unfortunately, if it’s an X or a Y gene infertility defect, you don’t want a son that’s infertile because he’d have to go through the same process. To me, it seems a logical thing; have an unaffected daughter, but it’s up to the couple.
