Question

H. In yeast, enzymatic step in histidine synthesis. A certain spontaneous mut but these mutants are defective frequently but this rate is not enhanced by any mutation. Remember the word cistron usually indicates a genetic locus (8 three cistrons (A, 8 and C in that order, each of which mediates an mutation is mapped in cistron A, oceurs quite possibte nature of the (gene). (5 points) in all three functions. Spontaneous reversion mutagen. Discuss the ene

Answer 1

Spontaneous mutation occur naturally, without any detectable external reasons. These arise as a result of errors in natural biological processes. Spontaneous mutations are another type of heritable changes in the structure of DNA, occurring due to natural factors. The three sources of spontaneous mutations are the errors in DNA replication, spontaneous lesions, and the transposable genetic elements. A common cause of spontaneous point mutations is the deamination of cytosine to uracil in the DNA double helix. A spontaneous mutation occurs due to natural processes like errors in DNA replication, spontaneous lesions, depurination and deamination and transposable genetic elements. Spontaneous mutations are important in forward genetics.