Give me a simple example of gene therapy!

Gene therapy is the fairly new method of disease treatment aimed mostly at genetic diseases. Basically, a normal allele is inserted into a patient's defective cells. This is a very new approach and most gene therapy is aimed at cancer treatment and hereditary genetic diseases, such as sickle cell anemia, cystic fibrosis, and muscular dystrophy.

Explanation:

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organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.