Gamma Radiation 



One kind of ionizing radiation, electromagnetic, readily 

 penetrates biological materials. 



Gamopetalous 



Refers to flowers that have more or less united Petals. 



Gamosepalous 



Refers to flowers that have more or less united Sepals. 



Garique (Garrique) 



Open vegetation consisting of dwarf, evergreen Scrub on 

 poor land in the Mediterranean region, cf. Maquis. 



Gastropod 



An animal in the class Gastropoda, phylum Mollusca, 

 e.g., slug, snail. 



Cause's Principle 



The generalization that states that two species do not 

 occupy exactly the same Niche. See Competitive exclusion 

 principle, GrinnelVs axiom. 



Geiger Counter 



An instrument for detecting Ionizing radiation. 



Geitonogamy 



The Pollination of a flower by pollen from another flower 

 on the same plant, cf. Autogamy, Cleistogamous^ Xenogamy. 



Gemma 



A structure consisting of a few cells which becomes 

 separated from the parent and grows into a new plant, found 

 in certain liverworts. 



Gene 



A localized unit of genetic material with a specific func- 

 tion in transmitting characters from one generation to the 

 following one. 



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