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A Barr body (named after discoverer Murray Barr) [1] or X-chromatin is an inactive X chromosome. In species with XY sex-determination (including humans), females typically have two X chromosomes, [ 2 ] and one is rendered inactive in a process called lyonization .
The bar is a metric unit of pressure defined as 100,000 Pa (100 kPa), though not part of the International System of Units (SI). A pressure of 1 bar is slightly less than the current average atmospheric pressure on Earth at sea level (approximately 1.013 bar).
The inactive X forms a discrete body within the nucleus called a Barr body. [38] The Barr body is generally located on the periphery of the nucleus , is late replicating within the cell cycle , and, as it contains the Xi, contains heterochromatin modifications and the Xist RNA.
Nuclear sexing can be done by identifying Barr body, a drumstick like appendage located in the rim of the nucleus in somatic cells. Barr body is the inactive X chromosome which lies condensed in the nucleus of somatic cells. A typical human (or other XY-based organism) female has only one Barr body per somatic cell, while a typical human male ...
This is a list of units of measurement based on human body parts or the attributes and abilities of humans (anthropometric units). It does not include derived units further unless they are also themselves human-based. These units are thus considered to be human scale and anthropocentric.
Koby Brea scored 18 points to lead No. 12 Kentucky to a 78-73 victory over No. 8 Tennessee on Tuesday night. Jaxson Robinson added 17 points as the Wildcats (15-5, 4-3 Southeastern Conference ...
Body roundness index (BRI) is a calculated geometric index used to quantify an aspect of a person's individual body shape. Based on the principle of body eccentricity, it provides a rapid visual and anthropometric tool for health evaluation. [1] Introduced in 2013, the BRI calculation can be used to estimate total and visceral body fat.
The Barr body is indicated by the arrow. They are only present in cells with XX chromosomes. This was the evidence searched for in Barr body tests of samples from female athlete's inner cheeks. From 1958 to 1992, all female athletes underwent mandatory sex verification tests before taking part in any IAAF or IOC event.