Occurrence of non-beneficial alleles in heterozyguos genotype is :

Genetic load

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Genetic drift

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Gene flow

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Selection

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Solution

The correct option is C Genetic load
Genetic load is the reduction in the mean fitness of a population relative to a population composed entirely of individuals having optimal genotypes.
It is due to the occurrence of non-beneficial alleles in heterozygous genotype.
Genetic load can be caused by recurrent deleterious mutations, genetic drift, recombination affecting epistatically favourable gene combinations, or other genetic processes.
So, the correct answer is 'Genetic load'

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