Meiotic Nondisjunction & Aneuploidy Simulator (2D)

Two homologous chromosome pairs are carried through a full meiosis — prophase condensation, metaphase I alignment, anaphase I homolog separation, cytokinesis, metaphase II alignment and anaphase II sister-chromatid separation — ending in four haploid gametes, drawn as a flat top-down diagram you can pan and zoom. Independent nondisjunction probabilities for meiosis I and meiosis II let you push the system toward producing trisomic (n+1) and monosomic (n−1) gametes on demand, while live readouts report each trial's exact chromosome count per gamete and the running aneuploidy rate across every trial you've run — the same formula as the 3D version, P(aneuploid) = p1 + (1 − p1)·p2, made visible one trial at a time.