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CH46 - Animal Reproduction Chapter 46 Two Main Categories...

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Animal Reproduction Chapter 46 Two Main Categories Asexual Reproduction – Ex: Budding in Hydra Sexual Reproduction – Ex: Copulation in Dogs Asexual Reproduction Common with Invertebrates – Individuals are formed from genes coming from only one parent – No fusion of eggs and sperm Advantages – No need to find and convince a mate – Offspring can be produced quickly Disadvantages – Offspring are identical Asexual Reproduction Fission One parent separates into two or more approximately equal-sized individuals Ex: Single-celled organisms (protozoa) Budding New individuals split off from existing ones Ex: Hydra Gemmules Release of specialized cells that can grow into new individuals Ex: Sponges Fragmentation Breaking of the body into several pieces, some or all of which develop into complete adults Ex: Plants Parthenogenesis Development of an unfertilized egg into a completely new individual Offspring are clones of their mother Ex: Many invertebrates, some reptiles and fishes
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