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BB lecture 2-18-09, Plants I

BB lecture 2-18-09, Plants I - Shared Characteristics The...

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Shared Characteristics … The difference between shared primitive characteristics and…shared derived chacteristics Example: Many animals have backbones… Mammals have backbones, so do birds, reptiles & fish If trying to construct a clade for mammalian species, the backbone serves as a primitive characteristic ‘shared’ with non-mammals. But, a character of mammals that other animals do not have is hair – since hair is unique to mammals, it is a derived characteristic , meaning it is only ‘shared’ with mammals , and not fishes, reptiles, etc..
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Analyzing the taxonomic distribution of homologies enables us to identify the sequence in which derived characters evolved during vertebrate phylogeny.
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Chapter 29 (pp.600-615) – Initial land colonization by plants Learning objectives: Describe four shared derived homologies that link charophyceans and land plants. Know five characteristics that distinguish land plants from charophycean algae. Explain how these features are adaptive for life on land. Distinguish among the stages of the alternation of generations life cycle Explain why most bryophytes are small. Explain why seedless vascular plants are most commonly found in damp habitats. Additional terms to know include…nonvascular plants, sporopollenin, fragmoplast, secondary compounds, sporangia, sporocytes, gametangia (archgonia/antheridia),vascular tissue, lycophytes, pterophytes, gymnospserm, angiosperm…
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