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3 Cards in this Set
- Front
- Back
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External Fertilization
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~Most common form of fertilization in aquatic habitats (mostly bony fishes, most amphibians)
~Sexual dimorphism can be present depending on breeding system ~There are usually no specialized organs for fertilization ~Hormonal control of reproduction is present (so males and females can reproduce at the same time) ~Once eggs are laid and fertilized, there is no nutritional contribution from the parents (only get what was put in egg in first place) |
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Internal Fertilization
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~Occurs in some aquatic organisms, such as live-bearing fishes
~Sexual dimorphism is almost always present ~There are usually specialized organs for fertilization ~Hormonal control of reproduction is present ~Parental contribution of nutrients may occur |
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Baculum (Penis Bone)
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~In many mammals, there is a bone in the penis called a baculum
~In many species the shape and size is species specific ~A baculum is found in primates (not humans), rodents, insectivores (moles and shrews), and carnivores (bears, dogs, cats, raccoons, walruses, etc.) |
