Dictionary » S » Sex chromatin

Sex chromatin

Definition

noun

The small mass of densely, inactive X-chromosome within the nucleus of somatic cell of females.


Supplement

Females normally have one sex chromatin whereas males have none. Thus, the presence of sex chromatin is one of the ways to determine sex or for gender verification. Test involving sex chromatin determination was previously common. Later, the test is replaced by the more advanced test such as polymerase chain reaction test.


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Re: Chromatin

Before replication there were 23 pairs of molecules, 23 of maternal origin and 23 of paternal origin, plus the maternally-contributed mitochondrial chromosome (which I'll ignore for the rest of this post). Counting chromosomal centromeres, there are 46 centromeres total. After replication there are ...

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by jonmoulton
Thu Sep 04, 2014 3:04 pm
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 887

Chromatin

If DNA residing in the cell is loosly packed DNA called chromatin, and if in the Interphase the chromatin replicates to prepare for mitosis, then it must be that when the chromatin replicated there were only 23 modules of DNA in the cell for it to replicate. ...

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by Hannamerika
Thu Sep 04, 2014 9:12 am
 
Forum: Genetics
Topic: Chromatin
Replies: 2
Views: 887

X chromosome inactivation

... chromosome inactivation is happening through transcriptional repression of the X chromosome. The X chromosome of male germ cells is in a condensed chromatin state and is transcriptionally repressed during early spermatogenesis but to my knowledge this is not considered as "X chromosome inactivation". ...

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by cathbr
Thu Jul 18, 2013 3:56 pm
 
Forum: Molecular Biology
Topic: X chromosome inactivation
Replies: 1
Views: 1612

cell structure

Not exactly 1 chromatin fibre equals 1 chromosome.

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by understandbiology
Thu Jun 27, 2013 12:39 pm
 
Forum: Cell Biology
Topic: cell structure
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Views: 2953

Apoptosis in the substantia nigra

... nigra in four normal aged subjects. Morphological characteristics of apoptosis, such as contact loss with surrounding tissues, cell shrinkage and chromatin condensation, were found in 2% of the total number of melanized neurons analyzed. Although endoplasmic reticulum appeared normal, mitochrondria ...

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by MarkHolland
Sat Mar 30, 2013 3:03 pm
 
Forum: Cell Biology
Topic: Apoptosis in the substantia nigra
Replies: 1
Views: 2516
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