reproduction in animalia. fig. 7.1 types of reproduction asexual – binary fission 1 ->2 –...
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Reproduction in Animalia
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Fig. 7.1
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Types of reproduction
• Asexual – Binary fission 1 ->2– Multiple fission or schizogony 1 -> many– Budding – a new organism buds off an existing
organism.– Fragmentation – organism breaks into fragments that
each for new organisms.– Parthenogenesis – ameiotic or meiotic.
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Sexual reproduction
• Offspring produced from union of gametes from two genetically distinct parents.
• Dioecious – separate sexes• Monoecious – an individual have both male
and female reproductive structures – called hermaphrodites
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• viviparous - give birth to live young• oviparous - lay eggs• ovoviviparity - eggs are retained inside the
female such that she gives birth to live young.
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Sponges
• Asexual – buds• Sexual – Produce heterogametes – sperm and
eggs from choanocytes or archaeocytes.• Some are viviparous – fertilization is internal,
zygote is retained and receives nourishment from parent. Others are oviparous – sperm and egg released into water, zygote develops externally.
• Results in free swimming flagellated larvae.
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Fig. 13.12
Craspedacusta spp.Freshwater hydrozoan
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Crustacea - Daphnia
Sexual and asexual reproduction
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Fig. 14.14Life cycle of human liver flukeClonorchis sinensis
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Fig. 16.19Mollusca
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Fig. 17.21
Annelida
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Fig. 21.25
Hemimetabolous metamorphosis
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Fig. 21.22
Holometabolous metamorphosis
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Fish
• External fertilization• Oviparous• May be ovoviviparous, e.g. some sharks• Sexes can change, large females become
males• Some forms of pollution causes sterility in fish
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Amphibians
• Tied to water through reproduction• External fertilization• Frogs – tadpole stage
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• Turtles- oviparous- internal fertilization- female burry eggs- nest temperature determines sex
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Birds
• Fertilization internal• Incubation external• Young precocial or altricial• Sex determination by chromosomes (Female
heterogametic)
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Monotremes
Duck-billed Platypus
oviparous
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Marsupials• Viviparous• Pouched• Choriovitelline placenta• Embryo encapsulated in shelled membrane• - hatch and then erodes a depression in the
placenta
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Placental mammals
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Fig. 8.25