Archive | Chromosomes

Down’s Syndrome: Definition, Fea­tures and Causes | Genetics

In this article we will discuss about:- 1. Definition of Down's Syndrome 2. Physical and Physiological Fea­tures of Down's Syndrome 3. Chromosomal Findings  4. Incidence 5. Causes. Definition of Down's Syndrome: The first autosomal abnormality described in man by John Langdon Down (1966) was known as Down's syndrome, more commonly used as mongolism. In this case, there is simple trisomy [...]

By |2016-12-12T07:34:23+00:00December 12, 2016|Chromosomes|Comments Off on Down’s Syndrome: Definition, Fea­tures and Causes | Genetics

Cat’s Cry Syndrome: Features and Modification | Genetics

In this article we will discuss about:- 1. Diagnostic Features of Cat's Cry Syndrome 2. Modification of Cat's Cry Syndrome 3. Findings. Diagnostic Features of Cat's Cry Syndrome: Some of the following features are not absolute in occurrence, and in that case values in the parentheses are the frequency of occurrence: i) The name of this syndrome refers to the [...]

By |2016-12-12T07:34:23+00:00December 12, 2016|Chromosomes|Comments Off on Cat’s Cry Syndrome: Features and Modification | Genetics

8 Main Criticisms for Lyon’s Hypothesis | Genetics

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 [...]

By |2016-12-12T07:34:23+00:00December 12, 2016|Chromosomes|Comments Off on 8 Main Criticisms for Lyon’s Hypothesis | Genetics
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