Timeline of the key developments in WGA and milestones of PGT. PGT-A/SR—preimplantation genetic testing for aneuploidies/structural rearrangements; WGA—whole-genome amplification; DOP-PCR—degenerate oligonucleotide primer PCR WGA technique; PEP-PCR—primer extension preamplification PCR WGA technique; MDA—multiple displacement amplification WGA technique; aCGH—array comparative genomic hybridization; MALBAC—multiple annealing and looping-based amplification cycles WGA technique; SNP—single nucleotide polymorphism; NGS—next generation sequencing [2,3,15,20,21,23,26,28,31,32,36,37,38,39,40,41].