Just one.
1
2
female
A female with 3 X chromosomes. (XXX) Two of the X chromosomes will be inactivated, leaving one functional X chromosome, 2 Barr bodies, and no Y chromosome.
BARR BODIES CAN BE SEEN AS A SMALL APPENDAGE ON THE NUCLEOUS OF A POLYMORPHONUCLEAR NEUTROPHIL OF BLOOD CELLS FROM A FEMALE HUMAN. THESE ARE ONE OF THE WHITE CELL TYPES SEEN ON A BLOOD SMEAR DONE ON A CBC. tim goodman clinical lab scientist
Females usually have one Barr body; males usually have none.
Sex in humans is determined by the combination of sex chromosomes, X and Y. In males, every cell in their body (except for erythrocytes (red blood cells, which are non-nucleated and do not contain DNA)) and sperm cells (which only contain either a single X or Y chromosome) contains both X and Y chromosomes. In females, every cell (except those previously mentioned in males) contains two X chromosomes, except that one of those (through a process believed to be random) X chromosomes atrophies into what is called a "Barr body". Basically, this is a transcriptionally inactive chromosome (in that there is no gene expression from this chromosome). Only 1 of the 2 X chromosomes in each cell undergoes this. Your question is worded strangely because it sounds like you're asking if the ENTIRE female body contains 2 Barr bodies, when in fact it contains billions and billions of bar bodies...however, I suspect you were asking on the cellular level, and thus every somatic (non-sex) cell in the female body contains a single Barr body and a single functional X chromosome.* *There are genetic anomalies that may be the exception to this, but this is in normal, healthy females.
if the extra Xwill be Barr bodies why dp kline felter males or Turnes female have certain problem
female
A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY, a condition known as Klinefelter's syndrome. In this case, the male somatic cells would also contain a Barr body. --- The Barr body is the highly-condensed chromatin structure taken up by an inctivated X chromosome. The number of Barr bodies equal the number of inactive chromosomes.
A female with 3 X chromosomes. (XXX) Two of the X chromosomes will be inactivated, leaving one functional X chromosome, 2 Barr bodies, and no Y chromosome.
A Barr body is an inactivated X chromosome. An XXXY cell would contain 1 Barr Body. Men have no Barr bodies, and women have 1.
Yes, a female with Down syndrome has three copies of chromosome 21, but only two copies of the X chromosome. Regarding sex chromosomes, she is genetically normal. For this reason X chromosome inactivation would occur, and she would have one Barr body per cell.
BARR BODIES CAN BE SEEN AS A SMALL APPENDAGE ON THE NUCLEOUS OF A POLYMORPHONUCLEAR NEUTROPHIL OF BLOOD CELLS FROM A FEMALE HUMAN. THESE ARE ONE OF THE WHITE CELL TYPES SEEN ON A BLOOD SMEAR DONE ON A CBC. tim goodman clinical lab scientist
inactive heterochromatin of cells from a female
True(:
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Females usually have one Barr body; males usually have none.
The Barr Body