Glodowski lec 2

Glodowski lec 2 - Chromosome DNA molecule conferring genetic information arranged in a linear sequence What does a chromosome look like in a cell o

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Chromosome: DNA molecule conferring genetic information arranged in a linear sequence What does a chromosome look like in a cell? o When laying around in the cell, it’s structure is not well condensed -> called chromatin o During mitosis and meiosis, they get condensed o All have 1 centromere (constricted area where spindles attach), 2 telomeres (ends) o Chromosomes can be distinguished by their Size P arm: short arm Q arm: long arm location of centromere TELOCENTRIC: at end ACROCENTRIC: off center SUBMETACENTRIC METACENTRIC Genes Every somatic cell has the same number of chromosomes o Humans: 46 o Drosophila: 8 o Cows: 60 In many eukaryotes, the number of chromosomes we talk about is the diploid number o Humans 46 = 2n n is haploid number the n is the number of UNIQUE chromosomes that an organism has. One set from mom, one set from dad.
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This note was uploaded on 01/20/2012 for the course GENETICS 380 taught by Professor Glodowski during the Fall '08 term at Rutgers.

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Glodowski lec 2 - Chromosome DNA molecule conferring genetic information arranged in a linear sequence What does a chromosome look like in a cell o

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