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Reproduction - Reproduction 1 Asexual reproduction a Single...

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Reproduction 1. Asexual reproduction a. Single parent – genes of offspring identical to parent’s b. Benefits – energy efficient and most successful in stable environment c. Three types i. Budding – part of parent’s body grows then detatches ii. Fragmentation – parent’s body breaks into pieces and each piece can develop a new animal iii. Parathenogenesis – unfertilized egg develops into adult 2. Sexual reproduction – fusion of two types of gametes to produce offspring a. Benefits – genetic variety and is adaptive in unstable changing environ. 3. Fertilization a. External – mating partners release eggs and sperm into water simultaneously b. Internal – male delivers sperm into female’s body c. Key concepts – most animals reproduce sexually by fusion of sperm and egg, but some animals reproduce asexually and some can reproduce either way, depending on conditions 4. Male reproductive system a. Testes – produce sperm and testosterone b. Series of conducting ducts c. Accessory glands d. Penis 5. Testes – in the scrotum, house of testes (hang low to keep lower temp. than body) a. Contain seminiferous tubules – site for sperm production (spermatogenesis) b. Interstitial cells – secrete testosterone, sperm production needs a high amount of testosterone c. Sertoli cells – nurse cell for spermatogenesis, produce signaling molecules 6. Conducting ducts a.
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