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Bell Question. What kinds of features are helpful in determining how related two organisms are? Answer on the back of your sheet Do not hand it in when you finish!. Phylogenetic Trees. Shows the evolutionary relationship between organisms over time. - PowerPoint PPT PresentationTRANSCRIPT
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Bell Question
What kinds of features are helpful in determining how related two organisms are?• Answer on the back of your sheet• Do not hand it in when you finish!
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Phylogenetic Trees
• Shows the evolutionary relationship between organisms over time
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• The root of the tree represents a common ancestor• The tips of the branches represent the descendants of that ancestor• As you read from roots to tips, you move
forward in time
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• Each node represents an ancestor that the descendants have in common
• The descendants split and became two separate organisms after their most recent common ancestor
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• The organisms that share the most recent common ancestor are the most closely related
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• We can include traits on the tree to show where they have evolved
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You try it!
Get into groups of 4
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Make a phylogenetic tree of the following technologies
• Remember that the tree goes from oldest at the root to most recently “evolved” at the branch tips– Cell Phones– Telephone (landline)– Telegraph (Morse code)– Blackberry– iPhone– Smoke signals
Label at least five “traits” that evolved on your diagram
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HomeworkMake your own phylogenetic tree of invertebrates (this example is on the website) on a large piece of paper• Do not need traits• Need colours,
names, and pictures (can be drawn, can be cut and pasted)
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Spectacular Sponges!
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• Aquatic animals
• Phylum name Porifera means “pore-bearer”
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Level of organization:
• Cellular– Life activities distributed among a number of
specialized cells– These cells are not coordinated– No tissues
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Body Plan
• Symmetry: asymmetrical
• Osculum: large opening which lets water out• Ostia: tiny holes which let water in
• Spicules: needles of silica which forms the skeleton of the sponge
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(Video)
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Digestion
• Done by collar cells• Food and water enter the sponge through the
ostia• The collar cells trap and digest the food• Amoeboid cells transport food throughout the
sponge
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Circulation
• Circulation, respiration, and excretion are carried out by diffusion
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Nervous System
• No head
• No nervous system
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Reproduction
• Sponges can reproduce both sexually and asexually
• Sexual reproduction:– Female releases eggs into the water and male
releases sperm– The sperm swims to the egg and fertilizes it– The fertilized egg (zygote) drops to the bottom
and grows
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Reproduction
• Asexual:– Buds (small, new sponges) develop on the adult– Buds drop off and develop into new sponges
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Motility (movement)
• Sponges are sessile, meaning they do not move
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Ecology
• Shelter for other species (mostly small invertebrates)
• Filter feeders: filter bacteria out of the water• Release chemicals that break up old shells and
dead coral – recycles calcium• Food source for some species of snails, sea
stars, and fish