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lec21 - Lecture 21 Aberrant Ploidy I Aberrant euploidy A...

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Lecture 21 – Aberrant Ploidy I. Aberrant euploidy A. examples of differing ploidy monoploid 1x diploid2x triploid 3x tetraploid 4x pentaploid 5x hexaploid 6x octaploid 8x B. in nature - in plants (and less commonly, animals) – 30 – 35% of naturally occurring plant species  are polyploid. - endopolyploidy – in many animals, some cells may be polyploid II. Monoploidy – 1n, rare result of errors in cell division A. Usually sterile B. in some species, some individuals are monoploid - males in social insects (ants, bees, wasps) - males produced by parthenogenesis - not sterile because C. useful experimentally and in agriculture - experimental use of monoploidy - but how do you get back to diploid? 1
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Picture 33 Picture 34 2
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Picture 35 Picture 36 III. Polyploids (odd vs. even chromosome #) A. Odd ploidies  1. origins of triploid
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