157 Mutations Key Ideas cra TGA codes tor stoE The oeieson a

157 Mutations Key Ideas cra TGA codes tor stoE The oeieson a recessive allele Aperaon Define the tem mutation How do mutasons increase vs raton? 2 iderofy the type of mutation that has occurred in the DNA sequences shown below. Normal DNA sequence: CCT GAT GCG AAG TTA TCA GTA CCA. ONA sequence 1: CCT GAT GCGTTA TCA GTA CCA DNA sequence 2 CCT GAT G AAG CCC TTA TCA GTA CCA ONA sequence 3 COT GAT GOG AAG TTATGA GTA CCA.

Solution

1). (a). Mutation is the change in original base pair sequences that convert one allele to another allele; it is a continual source of genetic variation

Mutations can be of two types based on their origin:

Spontaneous mutations

Induced mutations

Spontaneous mutations are those that occur in the absence of mutagens or the mutation inducing agents. They occur accidentally. Altered structure of nitrogenous bases during a normal biological process or chemical process generally leads to spontaneous mutations. They can also occur during the enzymatic process of DNA replication. In contrast, the induced mutations occur in the presence of mutagens, which can be either natural or artificial.

Mutations are the continual source of genetic variation because they DNA mutations are heritable. The inherited altered gene sequence causes genetic variation.