miércoles, 13 de julio de 2011

Vocabulary Chapter 17

 allele
An allele is one of two or more forms of a gene.



Allele Frequency
 is the proportion of all copies of a gene that is made up of a particular gene variant (allele).



Antibiotic
 Are powerful medicines that fight bacterial infections.





Balanced Morphism
  
       
Balanced polymorphism is a situation in which two different versions of a gene are maintained in a population of organisms



Biogeography
 Is the study of the distribution of species (biology) spatially (geography) and temporally (history). 




Bottleneck
 Is a phenomenon where the performance or capacity of an entire system is limited by a single or limited number of components or resources. 



Catastrophism
 The idea that Earth has been affected in the past by sudden, short-lived, violent events, possibly worldwide in scope.


Comparative Morphology