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20meiosis - Lecture 20 Meiosis Chapter 18 Cell Division The...

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Lecture 20: Meiosis Chapter 18: Cell Division
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The Big Picture What happens when gametes are formed? Meiosis
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Body Cells Human body cells (everything but sperm and eggs) are diploid Contain 23 pairs of chromosomes (2n = 46)
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Mitosis Diploid body cells are formed by mitosis (I.P.M.A.T.C.) One parent cell splits into two identical daughter cells (duplication division) Part of normal cell cycle
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Meiosis Reduction division Two divisions result in four daughter cells Containing ONE of the homologous pairs of chromosomes HALF as many chromosomes as the parent cell
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Parent and Daughter Cells Parent cell: diploid 2n = 46 in humans 23 pairs Daughter cell: haploid n = 23 in humans one member of each pair
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Gametes Haploid cells (after meiosis) mature into gametes Sperm cells in males Egg cells (oocytes) in females
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Fertilization When a sperm cell enters an egg cell , they combine their chromosomal pairs ( zygote ) 23 + 23 chromosomes = 46 total restored
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Meiosis Overview Diploid parent cell with homologous pairs Look alike (size and shape) Carry genes for the same traits E.g. 2 copies of gene for eye colour gives final result
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