CellBio6 - 1 Gametogenesis, Fertilization, and the...

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Unformatted text preview: 1 Gametogenesis, Fertilization, and the Principles of Early Development Meiosis Occurs During Formation of Eggs and Sperm • In most eukaryotic organisms, all cells in the body except for the egg and sperm cells, are diploid (2 n) • Mature eggs and sperm are haploid (1 n) • Eggs and sperm are produced in the gonads (ovaries, testes) by the process of meiosis • Diploid precursor cells develop into haploid gametes (egg cells and sperm cells) 2 Spermatogenesis; the Development of Sperm Cells • A spermatogonium divides by mitosis to form another spermatogonium and a primary spermatocyte (2 n) • The primary spermatocyte divides by meiosis I to produce 2 secondary spermatocytes • The two secondary spermatocytes divide by meiosis II to produce 4 spermatids • The 4 spermatids differentiate into 4 mature sperm cells (spermatozoa) 2n !! 3 1 n) !!! Formation of Spermatazoa (Sperm Cells) 4 A Sperm Cell has 3 Main Parts 1) The head contains the DNA and a secretory vesicle, called the acrosomal vesicle • The neck, or midpiece, contains a mitochondrion which supplies ATP • The tail contains the 9+2 arrangement of microtubules and the motor molecule dynein- powers a whip-like bending Oogenesis, Formation of Eggs • The large starting diploid cell, the oogonium (2 n), divides by mitosis to form two primary oocytes...
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This note was uploaded on 10/08/2010 for the course MCDB MCDB 1A taught by Professor Senghuilow during the Summer '09 term at UCSB.

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CellBio6 - 1 Gametogenesis, Fertilization, and the...

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