Meiosislect - Meiosis and Sexual Reproduction Meiosis...

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Meiosis and Sexual Reproduction
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Meiosis Special type of cell division Used only for sexual reproduction Halves the chromosome number prior to fertilization (2n n)
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Meiosis In diploid body cells chromosomes occur in pairs Humans have 23 different types of chromosomes Diploid cells have two of each type Chromosomes of the same type are said to be Homologous chromosomes (Homologues)
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Homologous Chromosomes Human Karyotype Identified based on: 1) appearance 2) length 3) centromere position Alleles
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Homologous Chromosomes Homologous chromosomes have genes controlling the same trait at the same position Many genes exist in several variant forms in a large population Homologous copies of a gene may encode identical or differing genetic information The variants that exist for a gene are called alleles
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Mitosis Mitosis 46 46 46 46 Human Meiosis Meiosis 46 46 23 23 23 23 23 23 n + n zygote Egg Sperm 2n
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Overview of Meiosis 2 Successive Nuclear Divisions
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Meiosis I Reduction division: Prophase I - Each chromosome internally duplicated (consists of two identical
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This note was uploaded on 11/02/2008 for the course BIOU 111 taught by Professor Pott-santone during the Fall '08 term at Northeastern.

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Meiosislect - Meiosis and Sexual Reproduction Meiosis...

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