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21 Cards in this Set
- Front
- Back
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Characteristics of Reproduction |
-continuity -same species of offspring -perpetuates parents' genetic material -diversity through genetic variability |
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Strategies of Reproduction |
-Binary Fission -Budding/Fragmentation -Regeneration -Parthenogenesis |
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Asexual |
offspring occur with no female gametes and no male sperm -mitosis |
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Binary Fission |
E. Coli 1-10^9 per hour |
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Budding/Fragmentation |
-porifera (sponges) -cnidaria (hydra) |
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Regeneration |
-Annelida (earthworms) -Platyhelminthes (flatworms) -Echinodermata (starfish) |
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Parthenogenesis |
Eggs develop without fertilization -bees -stick insects nematodes |
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Asexual Reproduction (advantages) |
-efficient, no eggs produced -no energy ideal for nonmobile -offspring produced quickly |
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Dioecious |
Species with definite male or female parts -insects -mammals -nematodes |
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Monoecious |
Species with both male& female organs or sex sells in the same individual (hermaphrodites) -worms -tapeworms -snails |
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External Fertilization (examples) |
outside the parent's body -spawning (crustacean, squid, oysters, sea urchin, fish) -involves signal use (pheromones) -survival rate low |
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Internal fertilization |
within females as adaptation to terrestrial evolution -water conserved inside mother -high survival rates |
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Ovium |
female egg with food -only 1 produced |
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Oviparity |
-external fertilization -some salmon & some sharks -amphibians -monotremes -some insects |
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Monotremes |
Mammals that lay eggs -duck billed platypus -spiny ant eater |
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Ovoviviparity |
-internally fertilized eggs -eggs hatch inside female -young born alive |
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Viviparity |
-live bearers -embryo fed vial female placenta -most mammals |
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Classification of Mammal |
1. Monotremes 2. Marsupials 3. Placentals |
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Monotremes |
-oviparous -found in Australia & New Guinea |
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Marsupials |
-viviparous -young fed & carried in pouch (@4-5 weeks) |
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Placentals |
-viviparous -carried in placenta |
