Genetics Lecture - GeneticsLecture 11/11/201009:19:00

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Genetics Lecture 11/11/2010 09:19:00 X doesn’t represent a chromosome well. H forms a better representation. The Chromosome Chromatin      – the unwound DNA and it’s associated proteins during interphase Chromosome      – DNA + proteins wound and coiled during the mitotic phases Chromatid      – a single copy of the chromosome; oneside of the dupiclated  chromosome Sister      Chromatids  – a duplicated (exact copy) pair of chromatids; these  appear early in mitosis (first see them together in prophase) Centromere      – the site where two sister chromatids are joined When a cell has chromosomes that mirror each other in size (two big, two  little) then the organism is diploid. Humans: 46 Chromosomes 23 pairs 2n = 46 or 23 pair n = 23 22 + sex chromosome Fruit Flies 8 chromosomes 4 pair 2n = 8  n = 4 Homologous Chromosomes – pair of chromosomes that look the same and code  for similar traits
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How are homologous chromosomes different from sister chromatids? Sister chromatids are 
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This note was uploaded on 10/13/2011 for the course BS 158H taught by Professor Elzinga during the Fall '08 term at Michigan State University.

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Genetics Lecture - GeneticsLecture 11/11/201009:19:00

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