The lifespan of individuals with Klinefelter syndrome appears to be reduced by approximately 2. Any variation from the standard karyotype may lead to developmental abnormalities. The University of Utah on Facebook.
The inversions, when plotted in tree form and independent of all other informationshow a clear "flow" of species from older to newer islands. Klinefelter syndrome: clinical and molecular aspects.
Menu Genomics home Health professionals Policy makers Patients and public Ethical, legal and social implications Research Craniofacial anomalies. Humans have 23 pairs of chromosomes, one half of each pair inherited from each parent. Prenatal Diagnosis. London: Arnold. During cell divisionan error called nondisjunction prevents X chromosomes from being distributed normally among reproductive cells as they form.
Drosophila inversion polymorphism. Structural abnormalities often arise from errors in homologous recombination.
All rights reserved. The effects of genes carried only on the Y chromosome are, of course, expressed only in males. There is a gene in the Y-chromosome that has regulatory sequences that control genes that code for maleness.
Regina Bailey is a board-certified registered nurse, science writer and educator. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Table Of Contents. However, they are usually much less severe in their effects.
Archived from the original on 15 March From Wikipedia, the free encyclopedia. Klinefelter syndrome is a sex chromosome disorder in boys and men that results from the presence of an extra X chromosome in cells. In the past, the observation of the Barr body was common practice, as well.