Neutral theory of molecular evolution- Developed by Motoo Kimura, who argued that most of the evolution of DNA sequences occurs by chance (genetic drift) rather than by natural selection.

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#Unit 13. Methods in Biology

Primer extension Using primer extension one can locate the 59-end of a transcript by hybridizing an oligonucleotide primer to the RNA of interest, extending the primer with reverse transcriptase to the 5’-end of the transcript, and electrophoresing the reverse transcript to determine its size

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#Unit 3. Fundamental Processes

Formation of the closed complex, in contrast, is readily reversible: polymerase can as easily dissociate from the promoter as make the transition to the open complex.

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#Id: 7388

#Unit 5. Developmental Biology

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#Id: 6079

#Unit 10. Ecological Principles

The World Conservation Union (IUCN) 

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#Id: 9930

#Unit 4. Cell Communication and Cell Signaling

Variation in Influenza Strains

Antigenic variation in HA and NA is generated by

Antigenic drift involves a series of spontaneous point mutations that occur gradually.

Antigenic shift results in the sudden emergence of a new subtype of influenza.