CSI Commercial Training and Development Practice Test 2026 – Your All-in-One Guide to Exam Success!

Complex aneuploidies are defined by two or more chromosomal abnormalities on different chromosomes, with autosomal involvement that is typically incompatible with life. In this pattern, the balance of essential gene dosage is so disrupted across autosomes that embryos or fetuses usually cannot develop, leading to early implantation failure or miscarriage. This distinguishes complex aneuploidies from single chromosomal changes or from broader categories of birth defects or fertility terminology. The other options refer to general outcomes or techniques rather than a chromosomal pattern, so they don’t describe the described condition.