Lecture 3 - Jan 13, 2010 (1)

Lecture 3 - Jan 13, 2010 (1) - What is polyploidy?...

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What is polyploidy? Polyploid : complete extra sets of chromosomes Triploid (3 n ), tetraploid (4 n ), and even higher ploidy levels . Can divide by mitosis but may have trouble with meiosis
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Odd polyploids and hybrids Why don’t odd polyploids and hybrids with odd number of chromosomes undergo meiosis?
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9.6 How Do Cells Die? Cells Necrosis or Apoptosis Necrosis: cell damaged, starved, poisoned Cell swells and bursts Cell contents released outside cause inflammation WBCs remove debris
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9.6 How Do Cells Die? Apoptosis: genetically programmed cell death. Suicide by unwanted cells Some cells like to die young to prevent problems related to old age (cancer) Induced by: Lack of signal to divide or DNA damage. Caspases activated. Cell is systematically degraded, ingested by neighbors – no inflammation
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Apoptosis Vs Necrosis
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Did we achieve our learning objectives? Why must cells divide? How do prokaryotes and eukaryotes divide? What is the cell cycle? How is it controlled? What happens during mitosis and meiosis? Why is Meiosis Important in Sexual Reproduction? How Do Cells Die?
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10 Genetics: Mendel and Beyond
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10 Genetics: Mendel and Beyond How are genes transmitted? What laws govern Inheritance? How chromosome behavior in meiosis explains these laws? How do genes and alleles interact? How are gene maps generated? What are sex chromosomes? What is sex-linked inheritance?
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What was understood about inheritance in early years? Early geneticists: Plant and animal breeders Breeders had two assumptions about how inheritance works: 1.Each parent contributes equally to offspring 2.Traits blend in the offspring and cannot subsequently separate.
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Who was Gregor Mendel? Gregor Mendel (1822-1884)
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This note was uploaded on 03/18/2010 for the course BIOSC Bio 210 taught by Professor Deshmukh during the Spring '10 term at Pittsburgh.

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Lecture 3 - Jan 13, 2010 (1) - What is polyploidy?...

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