Full Full<unk>  of an individual occurs due to non-disjunction when the cells are dividing (meiosis I or II) to form egg and sperm cells (gametogenesis). This can result in extra chromosomes in a sperm or egg cell. After fertilization, the resulting fetus has 48 chromosomes instead of the typical 46. Autosomal<unk> es * Cat eye syndrome where partial<unk>  of chromosome 22 is present * Pallister-Killian syndrome<unk>  12p) *<unk>  9p *<unk>  18p *<unk>  21, a rare form of Down syndrome Sex-chromosome<unk> es *<unk>  X * XXYY syndrome
Tetrasomy
Polysomy
Monosomy
Vestigial twin
Isodisomy
Bromism
Caudal duplication
Marker chromosome