L12_Meiosis - Meiosis & Gametogenesis Dr. Michael...

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1 Dr. Michael Henshaw BIO 120 - General Biology I Winter 2008 Lecture# - 12 Associated Reading – Ch. 13, Campbell
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2 Study Guide What is the difference between sexual and Asexual reproduction? What is an autosome? How is sex determined in humans? What is the purpose of meiosis? How does Meiosis differ from Mitosis? What happens in each step of Meiosis I and Meiosis II? When is chromosome number decreased in Meiosis? What is crossing over and what effects does it have on the resulting gametes? What is a tetrad? What are Chiasmata? Why do chromosomes sort independently of each other? What is a homologous pair?
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3 Comparison of Asexual and Sexual Reproduction In asexual reproduction, one parent produces genetically identical offspring by mitosis In sexual reproduction, two parents give rise to offspring that have unique combinations of genes inherited from the two parents
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4 Genes are segments of DNA Each gene has a specific locus (=position) on a certain chromosome One set of chromosomes is inherited from each parent Reproductive cells called gametes (sperm and eggs) unite, passing chromosomes, and the genes they bear to the next
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5 LE 13-3 5 µm Pair of homologous chromosomes Sister chromatids Centromere
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6 In Humans sex is determined by a
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L12_Meiosis - Meiosis & Gametogenesis Dr. Michael...

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