25 clones of aneuploid cells turner 26 mosaicism

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Unformatted text preview: cells Turner 26 Mosaicism involving sex chromosomes Humans – many Turner syndrome females are mosaics carrying both XX and XO cells (true XOs are not viable) Drosophila – When an XX female loses one of her X chromosomes during the first mitotic division after fertilization, a gynandromorph results, composed of equal parts male and female tissue 27 Drosophila bilateral gynandromorph + XX XO 28 happens in some birds - not a male female thing though. just a colour. Euploidy Euploid species contain only complete sets of chromosomes Most species of eukaryotes are diploid Polyploids – euploids that carry three or more complete sets of chromosomes, e.g., triploids (3x), tetraploids (4x), etc… 2n Monoploids – organisms which have only one complete set of chromosomes (usually infertile) Monoploidy and polyploidy are rare in the 29 higher animals. Euploidy Insects - a...
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