module 4 lecture 1

module 4 lecture 1 - Chromosomes and cell division...

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Chromosomes and cell division • Structures of prokaryotic and eukaryotic chromosomes • Prokaryotic cell division by fission • Two types of eukaryotic cell division: – Somatic cells divide by mitosis – Only germline cells undergo meiosis
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Central questions How is DNA packaged in cells? How do mitosis and meiosis differ? in purpose in mechanism in chromosome behavior and segregation Behavior of chromosomes in meiosis is key to sexual reproduction and genetics!
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Prokaryotic chromosomes R. Kavanoff, supercoiled E. coli chromosome J. Cairns, replicating E. coli chromosome
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Eukaryotes: Packaging of DNA into interphase chromatin, mitotic chromosomes
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Eukaryotic chromatin packaging animation
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Q: What properties are common to proteins used to package DNA in cells? A) They are highly basic (positively charged) B) They are highly acidic (negatively charged) C) They have the ability to straighten DNA molecules when they bind DNA D) They are hydrophobic E) They hydrolyze ATP to bind DNA
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Q: Prophase chromosomes consists of two sister chromatids joined at centromere. Each sister chromatid contains: A) A single strand of DNA B) A DNA duplex (double-stranded DNA molecule) identical to the sister chromatid
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module 4 lecture 1 - Chromosomes and cell division...

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