An auxotroph is

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(C) An auxotroph is a mutant organism that has lost the ability to synthesize one or more essential compounds required for its growth, such as amino a

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Mutant which has lost its ability to synthesize one or more essential compounds

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(C) An auxotroph is a mutant organism that has lost the ability to synthesize one or more essential compounds required for its growth, such as amino acids or vitamins. In $1944$, Beadle and Tatum irradiated $Neurospora \, crassa$ with $X$-rays and obtained a number of these nutritional mutants, which they termed auxotrophs. These organisms require the addition of the specific missing nutrient to their growth medium to survive.

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