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Affected individuals have two nonfunctional copies of the GALC gene. Parents of an affected child are healthy carriers and therefore have one normal GALC gene and one nonfunctional GALC gene
mutation
It eliminates the undesired gene and replaces it with a unaffected gene
Nothing gets added on to the DNA. Pol I is suppose to repair damaged sequences , so if it is nonfunctional, the damage sequences remain causing a mutated gene sequence.
a lethal gene
The answer to this question is Nucleosomes.
gene therapy.
I would guess that if a gene is not functioning normally then controlling the expression of that gene would be beneficial.
Direct DNA sequencing examines the direct base pair sequence of a gene for specific gene mutations. Some genes contain more than 100,000 bases and a mutation of any one base can make the gene nonfunctional.
The successful transfer of the luciferase gene from an animal to a plant indicates that the basic mechanisms for gene expression are shared by plants and animals.
When the repressor protein in not functioning then the gene that that protein was blocking will be "turned on". BTW its not right to cheat, even on study guides ;)
A knockout organism is an organism that's missing a functioning gene. They're used to test the function of genes and genetic diseases, because a researcher can observe specific changes in a gene knockout organism's gene expression and traits.