The below mentioned article provides notes on Edward syndrome. Aneuploidy for the autosome in man often produces both physical and mental defects. One well-known condition of 18-trisomy or E- trisomy is a clinical syndrome and the child generally dies before birth. In 1980, Edward and Patau simultaneously discovered a new syndrome associated with the presence of an extra group E [...]
The following points highlight the eight main criticisms for Lyon’s hypothesis. Criticism # 1. That XO, XXX, XY, XX etc. individual differ among themselves suggesting that the entire X chromosome is not genetically inactive. If it were so, an XX and XXX female would have had no difference at all. From various chemical stigmata it seems that a part of [...]
In this article we will discuss about:- 1. Dosage Compensation and Sex-Chromatin Bodies 2. Details about Dosage Compensation or Lyon's Hypothesis 3. Objectives behind the Proposition of Lyon's Hypothesis and 4. Evidences in Support of Lyon's Hypothesis. Dosage Compensation and Sex-Chromatin Bodies: In man it has been found that Y-chromosomes are genetically inert in comparison to the X-chromosomes and other [...]