Which test provides an operational definition of a gene?
a. complementation test
b. biuret test
c. gram stain
d. neurospora test
e. fluctuation test

The correct option is: A) Complementation test

Explanation:

Complementation test is used for determining that the mutations in the two strains, associated with a particular phenotype, are present in different genes.

The mutations are said to be complementary, if present in different genes.

Therefore, the complementation test is the process for determining the function of the gene in recessive allelism.

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the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.