The ER captures selected proteins from the cytosol as they are being synthesized. These are of two types:

Transmembrane proteins

Water-soluble proteins

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#Id: 9205

#Section 3: Genetics, Cellular and Molecular Biology

Change in environmental condition is not necessary for natural selection.

TLS Online TPP Program

#Id: 9206

#Section 3: Genetics, Cellular and Molecular Biology

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

#Section 3: Genetics, Cellular and Molecular Biology

TLS Online TPP Program

#Id: 9208

#Section 3: Genetics, Cellular and Molecular Biology

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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#Section 3: Genetics, Cellular and Molecular Biology

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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#Section 3: Genetics, Cellular and Molecular Biology

Genetic bottleneck

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