Figure Detail. As mentioned, sickle-cell anemia is the result of a change in a single nucleotide, and it represents just one class of mutations called point mutations. Changes in the DNA sequence can also occur at the level of the chromosome, in which large segments of chromosomes are altered.he result is the deletion of a DNA sequence in one chromosome, and the insertion of a DNA sequence in the other chromosome. Â© 2014 Nature Education Adapted from Pierce, Benjamin. Genetics: A Conceptual Approach, 2nd ed.
Also established in 1984, the Texas Division of Southwestern Bell Telephone, with headquarters at Dallas, became one of the largest nongovernmental employers in the state, serving 6.2 million customers in 549 Texas communities.
The Friends of the Library groups are volunteer charitable organizations that provide additional library funding and support. For more information, including how to join, contact your local community library manager. Bell Library was established in 1913 as the 29th branch of the County of Los Angeles Public Library System. After having been relocated several times, the library was built at the present location in 1960. Due to the rapid growth of the community, the building was expanded in 1973.