Animal Reproduction
Asexual Reproduction
Reproduction involving one parent. Offspring are genetically identical to the parent.
Budding: growth and separation of a small part of the parent to form an offspring.
Regeneration: replacement or growth of missing parts.
Sexual Reproduction
Reproduction involving two parents.
Hermaphrodite: organism that has both male and female sex organs.
External fertilization: eggs and sperm unite outside the body of the parents.
Internal fertilization: eggs and sperm unite inside the body of one of the parents.
 
Animal
Asexual Reproduction
Sexual Reproduction
Porifera
budding, gemmules
hermaphrodites; external fertilization
Cnidaria
budding
hermaphrodites; external fertilization
Platyhelminthes
regeneration (planaria)
hermaphrodites (planaria); parasites have complex sexual lifestyles
Nematoda
  
separate sexes (female is larger); internal fertilization
Annelida
  
hermaphrodites; clitellum produces mucus; internal fertilization
Gastropoda
  
terrestrial: hermaphroditic. aquatic: separate sexes, internal fertilization
Bivalvia
  
separate sexes; external fertilization
Cephalopoda
  
separate sexes; internal fertilization
Echinodermata
regeneration
separate sexes; external fertilization
Crustacea
  
separate sexes; internal fertilization
Arachnida
  
separate sexes; internal fertilization
Insecta
  
separate sexes; internal fertilization
Chondrichthyes
  
separate sexes; internal fertilization; ovoviviparous
Osteichthyes
  
separate sexes; external fertilization
Amphibia
  
separate sexes; external fertilization
Reptilia
  
separate sexes; internal fertilization; amniote egg laid outside body
Aves
  
separate sexes; internal fertilization; amniote egg laid outside body
Mammalia
  
separate sexes; internal fertilization; young develop in uterus

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