Conditional Alleles Are Mutant Gene Versions Encoding Proteins That Can

question 58

Essay

Conditional alleles are mutant gene versions encoding proteins that can function normally at the permissive condition but are defective at the restrictive condition.One commonly used condition is temperature.Conditional alleles are especially useful to geneticists because they permit the study of essential genes.At the permissive temperature, the organism lives normally.When the organism is shifted to the nonpermissive temperature, the effect of inactivating the gene can be studied.Which of the three types of mutation shown in Figure 19-19 is most likely to lead to a conditional allele? Explain your answer.
Figure 19-19

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