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lecture_22 - 1 Lecture 22 Outline of lecture 22 Definitions...

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1 Lecture 22 Outline of lecture 22 Definitions and terminology Haploidy and monoploidy Meisosis in monoploids and haploids Autopolyploid Autotriploidy Meiosis in autotriploids Autotetraploidy Meiosis in autotetraploids Allopolyploidy Most allopolyploids behave meiotically like diploids
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VARIATION IN PLOIDY = variation in the number of genomes. Genome is a monoploid set of chromosomes absolutely necessary for the existence of an organism. The number of chromosomes in a genome is symbolized by x . For example, for humans x = 23. Nomenclature : Count the number of genomes. Attach a GREEK prefix reflecting the number of genomes to -PLOIDY or PLOID. 1 genome MONO 2 genomes DI 3 genomes TRI 4 genomes TETRA 5 genomes PENTA 6 genomes HEXA In general, when there are more than two genomes we talk about POLYPLOIDY. Haploidy The gametic chromosome number. It is symbolized by n. For example, for humans, n = 23. Monoploidy
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This note was uploaded on 12/13/2009 for the course BIS 101 taught by Professor Simonchan during the Fall '08 term at UC Davis.

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lecture_22 - 1 Lecture 22 Outline of lecture 22 Definitions...

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