Introduction to Animals Development, Symmetry, Tissues, Classification AP Biology Unit 6.
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Transcript of Introduction to Animals Development, Symmetry, Tissues, Classification AP Biology Unit 6.
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Introduction to AnimalsIntroduction to Animals
Development, Symmetry, Tissues, Classification
AP BiologyUnit 6
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Defining Characteristics of Animals
• Multicellular
• Heterotrophs
• Sexual reproduction followed by development of body tissues and organs from layers of embryonic tissue
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Animal Development
• Following fertilization, animal embryos develop in a systematic fashion
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Animal Development• Cleavage
– A series of rapid cell divisions – No time for cells to grow in between divisions
• Gastrulation – Formation of layers of tissue that eventually
develop into body parts and organs
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Body Symmetry
• 3 different categories of body symmetry– No symmetry (Asymmetrical)
• Ex. Sponges (Porifera)– Radial symmetry– Bilateral symmetry
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Radial Symmetry
• One main axis in the center
• No left or right sides– dividing the animal along any axis makes it a mirror image on each side.
• Ex. Sea Anemones, Cnidarians (jellyfish)
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Bilateral Symmetry
• Has a left and right side– only one plane will divide the animal so that the two sides are mirror images of one another.
• Ex. Humans, fish, insects (most animals have bilateral symmetry)
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Directional Terms
• There are certain directional terms that can be associated with bilateral symmetry
• Dorsal = top side (think dorsal fin on dolphins)
• Ventral = bottom side
• Anterior = the end towards the head
• Posterior = the end towards the tail
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Embryonic Germ Layers
• Adult body parts develop from embryonic germ layers
• There are 3 different germ layers– Ectoderm– Mesoderm– Endoderm
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Ectoderm
• Outermost layer
• Develops into skin, nervous system, sensory organs
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Mesoderm
• Middle layer
• Develops into muscles, bones, circulatory system, excretory system, most of reproductive system
• Not all animals have mesoderm
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Endoderm
• Inner most layer
• Develops into the digestive system, respiratory system
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Diplo or triplo?
• Not all animals have all 3 germ layers• Diploblastic = only have 2 germ layers (no
mesoderm, only endoderm and ectoderm)– Ex. Cnidarians (jelly fish)
• Triploblastic = have all 3 germ layers – All bilaterally symmetrical animals (worms,
birds, mammals, etc)– Closely linked to cephalization (concentration
of nervous system and sensory organs close to head region)
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Body Cavities
• Most animals have a body cavity (fluid filled space) between the endoderm and ectoderm
• Coelom = body cavity lined with mesoderm
• Type of body cavity influences how the animal moves
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Types of Body Cavities
• Acoelomate– Lack an enclosed body cavity– Instead, the space is filled with cells– Ex. Flatworm
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Types of Body Cavities
• Pseudocoelomate– Have a fluid filled space
in which many organs are suspended
– Only one side (outer side) is lined with mesoderm (muscle)
– Can’t control body shape as well since only one layer of muscle
– Ex. Roundworm
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Types of Body Cavities
• Coelomate– Have a coelom – body cavity lined with
mesoderm on both sides– Better control over movement since there are
more muscles present (usually going in several different directions)
– Ex. Earthworm, humans
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Protostomes vs. Deuterostomes
• Excluding sponges, cnidarians and ctenophores, all other animals can be classified as either a protostome or a deuterostome.
• Classification has to do with how the embryo develops.
• Early in development a cavity forms
• Blastopore = opening to the cavity
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Protostomes
• Blastopore becomes the mouth of the animal (means “mouth first” in Greek)
• Cleavage– Spiral = cleavage occurs in planes
diagonal to the vertical– Determinate = The “fate” of each
cell is determined very early – Examples include: molluscs,
annelids (earthworms), arthropods
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Deuterostomes• Blastopore becomes the anus
(means “mouth second” in Greek)• Cleavage
– Radial = cleavage occurs along lines that are parallel or perpendicular to the vertical
– Indeterminate = the “fate” of each cell is not determined until a little later (early cells can still become any type of cell– “stem cells”)
– Examples include: Echinoderms, Chordates (have a backbone)
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Animal Classification
• Based on developmental morphology
• Molecular evidence suggests that this classification may not be entirely accurate
• Common ancestor of all animals is thought to be a colonial protist with a flagella
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Animal Classification
• “Basal” animal = porifera (sponge) = simplest animal; at the bottom of the evolutionary tree
• Most animals have bilateral symmetry
• All animals are thought to belong to a group called Metazoa
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Scientific Names for Animals
• Porifera = sponges• Cnidarians = jellyfish• Platyhelminthes = flatworms• Nematodes = roundworms • Annelids = Earthworms• Arthropods = insects, crustaceans• Echinoderms = starfish• Chordates = humans, birds, fish, amphibians
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