Lec64%20Plant%20Dev%201%2009

Lec64%20Plant%20Dev%201%2009 - Plant Development I...

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3/11/09 1 Plant Development I Flowering Plant Evolution and Reproduction Which tissue in a plant is triploid (3n)? A) pollen tube B) sperm nucleus C) endosperm D) ovary E) synergid Which tissue in a plant is triploid (3n)? A) pollen tube B) sperm nucleus C) endosperm D) ovary E) synergid * (a) Land plant phylogeny Darwin called this an “abominable mystery” Which characters are best for establishing evolutionary relationships? Molecular analysis by the Angiosperm Phylogeny Group has helped enormously. This analysis relies on comparisons of several genes LE 30-12aa Amborella trichopoda Water lily ( Nymphaea “Rene Gerald” ) Star anise ( Illicium floridanum ) BASAL ANGIOSPERMS Is Amborella an ancient plant? Illicium verum
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3/11/09 2 Amborella phloem cells are similar to highly derived lineages LE 30-7 Stamen Filament Anther Stigma Carpel Style Ovary Petal Receptacle Ovule Sepal LE 30-12bb Pygmy date palm ( Phoenix roebeleni ) Veins usual y paral el Vascular tissue scattered Stems Pyrenean oak ( Quercus pyrenaica ) EUDICOTS MONOCOTS Leaf venation Vascular tissue usual y arranged in ring Veins usual y netlike LE 30-12bd Barley ( Hordeum vulgare ), a grass Floral organs usual y in multiples of three Pol en Zucchini
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This note was uploaded on 10/20/2009 for the course BIO G 1102 taught by Professor Walcott during the Spring '08 term at Cornell.

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Lec64%20Plant%20Dev%201%2009 - Plant Development I...

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