Sequences that are involved with termination are called ter sites. A ter site contains a short, 23-bp sequence.

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#Unit 11. Evolution and Behavior

Change in environmental condition is not necessary for natural selection.

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#Id: 9206

#Unit 11. Evolution and Behavior

Genetic drift 

Genetic drift is an evolutionary force, in which allelic frequency change over generation Just by chance (sampling error). 

The deviations from the expected ratios are random, the direction of change is unpredictable.

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#Id: 9207

#Unit 11. Evolution and Behavior

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#Id: 9208

#Unit 11. Evolution and Behavior

CAUSES OF GENETIC DRIFT

Genetic drift in a small population over multiple generations can significantly affect the composition of a population’s gene pool. 

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#Unit 11. Evolution and Behavior

Founder effect

A few individuals form a population start a new population with a different allele frequency than the original population.

Sampling error can arise is through the founder effect, which results from the establishment of a population by a small number of individuals.

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#Unit 11. Evolution and Behavior

Genetic bottleneck

Genetic drift arises is through a genetic bottleneck, which develops when a population undergoes a drastic reduction in size