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REPRODUCTION - Coggle Diagram

- - - - Vegetative propagation
    - - Binary fission
        
        bacteria
  - - - sexual
        
        when fertilization occur,then the reproduction is sexual
        
        fusion of the female and male gamete
- - - - incomplete
        
        nymph
        
        adult
        
        egg
        
        example:flea
        
        example:dragonfly
- - - - MADE OF MESODERM
        
        repeoductive system
        
        skeleton musle system
        
        circulation
  - - - MADE OF ENDODERM
        
        digestive system
        
        respiratory system
        
        excetory system
  - - - nerves
      - spinal cord
      - brain
- - - - nucleus
      - centriole
      - acrosome(enzyme)
    - - mitochondrion(energy)
      - neck
    - - tail(flagellum)
      - plasma membrane
  - - - membrane
      - zona pelluccida
      - cytoplasm
      - fillicle cells
      - nucleus
      - corona radiata
      - cortical granules(enzymes)
- - - - HUMAN EARLY EMBRYOGENESIS AND STAGES
        
        STEP5:blastocyst(day5)
        
        STEP5:implatation o f the blastocyst(day6-7 )
        
        STEP3:morula-32cells,the SAME size as zygote(day4)
        
        STEP6:gastrulation(day15,16)
        
        STEP2:cleavage-very rapid迅速的 and quickly cell division,splitting into two,WITHOUT growing
        
        STEP7:neurulation(week3-4)
        
        notochord脊索
        
        nervous system
        
        STEP1:zygote
- - - - ACROSOMAL REACTION
        
        the release of hydrolytic enzymes which softens the zona pellucida
        
        4-nucleus transfer
        
        3-realising the enzymes in the acrosome
        
        2-sperm binding
        
        1-contact between sperm and egg cell
      - CORTICAL REACTION
        
        hardening of the jelly coat post fertilization to prevent potential polyspermy.