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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#Section 3: Genetics, Cellular and Molecular Biology

Allele frequency when genotype frequency is given

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#Section 3: Genetics, Cellular and Molecular Biology

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#Section 3: Genetics, Cellular and Molecular Biology

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#Section 3: Genetics, Cellular and Molecular Biology

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#Section 3: Genetics, Cellular and Molecular Biology

Loci with  multiple alleles

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#Section 3: Genetics, Cellular and Molecular Biology

X-linked loci

Allele frequency when genotype frequency is given