Chapter 48

Chapter 48 - Chapter 48 Physiology of Reproduction Meiosis...

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Chapter 48 Physiology of Reproduction
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Meiosis ¢ Gametes l Haploid complement (n) ¢ Gametogenesis l Process of gamete formation with the reduction by half of the chromosome number ¢ Homologous chromosome l Carries genes for the same traits
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Meiosis ¢ Zygote l Fertilized egg l Diploid (2n) ¢ Meiosis I l Prophase 23 tetrads Homologues chromosomes synapse Chiasmata or crossover
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Meiosis l Metaphase l Anaphase Homologues separates Dyads stays together l Telophase 2 cells with diploid number of chromosomes
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Meiosis ¢ Meiosis II l Prophase No chromosome replication Cells are diploid l Metaphase
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Meiosis l Anaphase Breaks of the centromeres will result each cell having one chromatid 4 daughter cells Crossover and the way in which the homologues align on the spindle equator during the first maturation division introduces a great variability in the resulting gametes
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Spermatogenesis ¢ It is the male gamete formation ¢ Starts at puberty and continues throughout life
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Spermatogenesis
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Spermatogenesis ¢ Steps of sperm formation: ¢ Spermatogonia (2n) l Stem cell l Found in the seminiferous tubules l It undergoes mitosis and forms one primary spermatocyte and one spermatogonium l Phase regulated by FSH
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Spermatogenesis ¢ Primary spermatocyte (2n) l It undergoes to a growth phase l It undergoes to meiosis I after the growth phase and forms the secondary spermatocyte ¢ Secondary spermatocyte (n) l It undergoes meiosis II and produces 4 spermatids
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Spermatogenesis ¢ Spermatids (n) l Nonfunctional gametes l No motile l They undergo spermiogenesis and form the sperm
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This note was uploaded on 01/06/2012 for the course BIOL 2402 taught by Professor Elainefanin during the Fall '11 term at Collins.

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Chapter 48 - Chapter 48 Physiology of Reproduction Meiosis...

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