Negative control of the lac operon. 

No lactose; repression. The lacI gene produces repressor, which binds to the operator and blocks RNA polymerase from transcribing the lac genes.

TLS Online TPP Program

#Id: 2167

#Unit 11. Evolution and Behavior

Natural selection is any consistent difference in fitness among different classes of biological entities.

TLS Online TPP Program

#Id: 2168

#Unit 11. Evolution and Behavior

Fitness is as the number of offspring an individual leaves in the next generation.

TLS Online TPP Program

#Id: 2169

#Unit 11. Evolution and Behavior

Average fitness

In a species, only 1 of every 1000 seeds survives to reproductive age, and that those that survive produce an average of 3000 seeds.

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#Id: 2170

#Unit 11. Evolution and Behavior

The components of fitness are survival and reproduction.

TLS Online TPP Program

#Id: 2171

#Unit 11. Evolution and Behavior

Fitness

TLS Online TPP Program

#Id: 2172

#Unit 11. Evolution and Behavior

Selection coefficient - which is the relative intensity of selection against a  genotype

Selection coefficient (1 - W)