By Philip M. Parker
In March 2001, the nationwide Institutes of well-being issued the next caution: "The variety of websites providing health-related assets grows on a daily basis. Many websites offer invaluable info, whereas others can have info that's unreliable or misleading." moreover, as a result of the fast bring up in Internet-based info, many hours could be wasted looking out, identifying, and printing. on account that simply the smallest fraction of data facing Abetalipoproteinemia is listed in se's, corresponding to www.google.com or others, a non-systematic method of web examine could be not just time eating, but additionally incomplete. This e-book used to be created for doctors, scholars, and individuals of most people who are looking to behavior scientific examine utilizing the main complicated instruments to be had and spending the smallest amount of time doing so.
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Extra resources for Abetalipoproteinemia - A Bibliography and Dictionary for Physicians, Patients, and Genome Researchers
Acquired mutations in somatic cells (cells other than sperm and egg cells) cannot be passed on to the next generation. Mutations may also occur in a single cell within an early embryo. As all the cells divide during growth and development, the individual will have some cells with the mutation and some cells without the genetic change. This situation is called mosaicism. Some genetic changes are very rare; others are common in the population. Genetic changes that occur in more than 1 percent of the population are called polymorphisms.
When mitosis is not regulated correctly, health problems such as cancer can result. The other type of cell division, meiosis, ensures that humans have the same number of chromosomes in each generation. It is a two-step process that reduces the chromosome number by half—from 46 to 23—to form sperm and egg cells. When the sperm and egg cells unite at conception, each contributes 23 chromosomes so the resulting embryo will have the usual 46. Meiosis also allows genetic variation through a process of DNA shuffling while the cells are dividing.
The rest of the genes are repressed, or turned off. The process of turning genes on and off is known as gene regulation. Gene regulation is an important part of normal development. Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell, for example. Gene regulation also allows cells to react quickly to changes in their environments. Although we know that the regulation of genes is critical for life, this complex process is not yet fully understood.