Stem cells are a class of undifferentiated cells that are able to differentiate into specialized cell types. S<span>tem cells have been found in tissues such as the brain, bone marrow, blood, blood vessels, skeletal muscles, and skin.
i hope this helps.</span>
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that maybe they should find a diffrent resident or they could tell her in a nice way that she smells of cigarette smoke and that you cant handle the smell of it
Explanation:
Answer:
Harmful mutations may cause genetic disorders or cancer. A genetic disorder is a disease caused by a mutation in one or a few genes. A human example is cystic fibrosis. A mutation in a single gene causes the body to produce thick, sticky mucus that clogs the lungs and blocks ducts in digestive organs.
Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.
only a small percentage of mutations cause genetic disorders—most have no impact on health or development. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.