lecture_notes_10_31_07 - Chromosome Number, outline Lecture...

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Chromosome Number, outline – Lecture 10 2007 Chromosome Number [Essential reading: SS 106-114] Ploidy Terminology [Every organism has a standard chromosome number] [A specific collection or set of chromosomes accounts for that number] Multiples of the basic set of chromosomes is ploidy Organisms or cells with a balanced set of chromosomes are euploid Those with an unbalanced set of chromosomes are aneuploid Aneuploidy can involve one or more extra or missing whole chromosomes, or chromosome arms [From Life Cycles discussions:] Variation in ploidy between meiosis and fertilization, haploid diploid haploid diploid ……, reflects multiples of ploidy, 1n, 2n, 1n, 2n,…. So, 2n refers to the diploid phase of the life cycle ; 1n or n, to the haploid Elevated ploidy Nearly all animals are diploid with haploidy only in gametes (diplontic) 2 sets of chromosomes = diploid = 2x = 2n Many plants have extra complete sets of chromosomes (polyploidy) 3 sets of chromosomes = triploid = 3x = 2n 4 sets of chromosomes = tetraploid = 4x = 2n 5 sets of chromosomes = pentaploid = 5x = 2n 6 sets of chromosomes = hexaploid = 6x = 2n, et cetera
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This note was uploaded on 04/29/2008 for the course BIOCORE 301 taught by Professor Howell during the Fall '07 term at Wisconsin.

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lecture_notes_10_31_07 - Chromosome Number, outline Lecture...

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