Dna damage can occur as a result of exposure to chemicals or ultraviolet radiation. This is what happens during nucleotide excision repair of damaged dna. A multienzyme complex crosses the DNA in search of distortions in the double helix, once located, the phosphate skeleton of the affected chain is cut on both sides of the altered region, a helicase eliminates the oligonucleotide resulting from digestion, the "Gap" "is filled with a DNA polymerase and a ligase.
Speciation is founded on the principle of genetic mutations and
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speculated genetic possibilities</span>
All of the chemical reactions in an organism required to sustain life
You may not operate a vehicle unless all child passengers FOUR YEARS OF AGE AND UNDER are properly restrained with an appropriate safety device.
Traffic law requires that children four years and below must be properly restrained in the vehicle using appropriate devices such as car seats.
Children older than four years have to use the safety belt when they are inside the car.
<span>A heterozygous individual is if a mutation occurs in just one copy of the gene.
If both copies of the gene are mutated than the individual is homozygous</span>
