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CSU - BC 103 - Life 103 Week 7 - Class Notes

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CSU - BC 103 - Life 103 Week 7 - Class Notes

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background image Angiosperm Reproduction & Biotechnology key features of angiosperm life cycle —flowers
—double fertilization
flowers have 4 floral organs that are modified leaves —carpels
stamen - male reproductive structure that consists of a filament stalk with a sac 
called an anther where pollen is produced
carpel - female reproductive structure that consists of an ovary at the base and a 
style leading up to a stigma where pollen is received
transfer of pollen can be done by water, wind, or animals (most commonly animals) bees are the most important insect pollinators double fertilization - 2 sperm deposited into embryo sac —one sperm fertilizes egg—>zygote
—other sperm combines with central cell (has 2 polar nuclei)—>triploid food-
storing endosperm (3n) endosperm is thin in monocots and thick in eudicots  a seed has 3 ploidys  —integument (seed coat)=2n
structure of mature seed —embryo, food supply, seed coat
—seed dehydrates as it matures and enters state of dormancy—>increases 
chance seed germinates at advantageous time/place —breaking of dormancy often requires specific environmental cues A. animal digestion
B. temp or light changes
C. fire
D. water
—embryo consists of embryonic axis below cotyledons (hypocotyl, terminates in  the radicle) attached to 2 fleshy cotyledons (seed leaves) seed germination and development —germination depends on imbibition, the uptake of water by dry seeds
—radicle emerges first to anchor plant
sexual reproduction - increases genetic variation, evolutionarily advantageous but 
only a fraction of seedlings survive
asexual reproduction - genetically identical organisms, no need for pollinator and can 
be beneficial to successful plant in stable environment
fragmentation is common form of asexual reproduction
background image —in some species a parent plant’s root system gives rise to adventitious  shoots that become separate shoot systems some flowers self-fertilize to ensure every ovule will develop into a seed dioecious species have staminate and carpellate flowers on separate plants people modify crops by breeding and genetic engineering (artificial selection) —hybridization common in nature used by breeders to introduce new genes
—genetically modified plants may increase quality and quantity of food worldwide
—some plants have been modified to be resistant to insects and certain diseases
golden rice is transgenic modified crop that puts vitamin A in rice
—most serious concern is introduced genes escaping into related weeds through 

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School: Colorado State University
Department: Biology
Course: Biology of Organisms-Animals and Plants
Professor: Jennifer Dewey
Term: Fall 2016
Tags: Biology
Name: Life 103 Week 7
Description: Soil and plant nutrition, angiosperm reproduction and biotechnology
Uploaded: 03/04/2016
4 Pages 9 Views 7 Unlocks
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