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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Two types of plant peroxisomes:

Present in leaves - participates in photorespiration.

Present in germinating seeds (glyoxysomes) - converts fatty acids into sugars.

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β oxidation

In mammalian cells, occurs in mitochondria & peroxisomes.

In yeast and plant cells, occurs in peroxisomes.

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β oxidation 

A major function of the oxidation reactions is the breakdown of fatty acid molecules.

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When excess H2O2 accumulates in the cell, catalase converts it to H2O through the reaction.

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Catalase uses the H2O2 to oxidize a variety of other substrates (formic acid, formaldehyde, and alcohol) by the “peroxidation” reaction.

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Peroxisomes carry out oxidation reactions leading to the production of hydrogen peroxide.