Genetics assignment three Essay Example | Topics and Well Written Essays - 500 words

Genetics assignment three - Essay Example refers to variant expression of chromosomes, parts of chromosomes, or individual genes, depending on any one of the two sexes from where they get inherited. For the achievement of imprinting, genetic materials can get modified during the process of gamete creation or near the beginning embryonic growth in any of the two sexes (Judd 33). Therefore, the imprinted genes determine the traits that are articulated in a different way than would be the expected case under distinctive Mendelian inheritance. This assertion is false since imprinting is not specifically activation of the Y chromosome because with imprinted genes one can inherit only one working copy of the gene both from the mother or a father (Judd 46). Therefore, depending on the gene, either the copy of the father or the mother, by addition of methyl groups at some stage during sperm or egg formation can epigenetically get silenced. b) Turner mosaicism could have arisen through errors in early fetal cell division that resulted in some of the cells having two complete copies of the X chromosome whereas the other have only one copy. The absent X chromosome results in developmental faults in the fetus. Judd, Sandra J.  Congenital Disorders Sourcebook: Basic Consumer Health Information about Nonhereditary Birth Defects and Disorders Related to Prematurity, Gestational Injuries, Congenital Infections, and Birth Complications, including Heart Defects, Hydrocephalus, Spina. 2nd ed. Detroit, MI: Omnigraphics, 2007.