Normal - structure, number, aneuploidy. Autosomes. Sex chromosomes. Mosaicism - tissue limited - true, artefact, rings, markers, bisatellited and dicentrics. Structural alterations - translocations, inversions, duplications, deletions, partial (tertiary)trisomy from unbalanced translocations. Segregation at meiosis - adjacent I, II. Alternate. Recombination. |