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
Definitions:
Structures
The arrangement or organization of interrelated elements in a material object or system, also applicable to abstract entities like societies.
Society
A group of individuals involved in persistent social interaction, or a large social group sharing the same geographical or social territory, typically subject to the same political authority and dominant cultural expectations.
Disenfranchise
The revocation of the right to vote or other rights of citizenship, often affecting specific populations or groups.
Convicted of Felonies
Refers to individuals who have been found guilty by a court of law for committing crimes considered severe.
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