Chapter 13 Barrons

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Chapter 13 Barrons

• Animal Reproduction and
• Development

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GOAL OF LIFE????
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Asexual Reproduction
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Sexual reproduction

• VARIATION!!!!

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• Seminiferous Tubules
• Each testis contains over 100 yards of tightly
  packed seminiferous tubules. Around 90 of the
  weight of each testes consists of seminiferous
  tubules. The seminiferous tubules are the
  functional units of the testis, where
  spermatogenisis takes place. Once the sperm are
  produced, they moved from the seminiferous
  tubules into the rete testis for further
  maturation.

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Female Reproductive
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Name of phase Days
menstrual phase 14
follicular phase (also known as proliferative phase) 513
ovulation (not a phase, but an event dividing phases) 14
luteal phase (also known as secretory phase) 1526
ischemic phase (some sources group this with secretory phase) 2728
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Fertilization
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Embryonic Development

• Cleavage
• Gastrulation
• Organogenesis

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Frog Embryo
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Bird Embryo
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Cytoplasmic Determinants
I. Mature Egg
                                                                                                                     
II. Fertilized Zygote
                                                                                                                     
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Grey crescent
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Embryonic Induction
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Hox Genes