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Pair Drumsticks

June 14th, 2010 admin No comments

Pair Drumsticks

The differentiation of the gonad

some (like those of group G), then the division average reduction of sperm X chromosome and the other half carry a Y chromosome in normal cells of women have two X chromosomes, whereas, after the reduction division of chromosomes in each oocyte number X. Conjugation sperm and ova give rise to XX and XY pairs again.

All normal body cells have the male (XY) or female (XX) of the Constitution, and in many cells of the body is a difference in their nuclei can be recognized in regular session on the stained preparations. In the cells of a smear the mouth, for example, or polymorphonuclear leukocytes, a small nodule of chromatin (the Barr body, or "leg nuclear) can be seen near the nuclear membrane in many normal cells in women but not among normal males. This knot of chromatin is probably the second (inactive) chromosome X, where no men.

normal women, thus "chromatin positive and normal men are" negative "chromatin, but presence or absence of chromatin nodule is not a complete proof of the status of individual chromosomes, a study of cell cultures gives a quite reliable.

The Y chromosome can also be recognized by affmity it has a selective approach to quinacrine dihydrochloride fluorescence staining.

Differentiation based on gender is determined by genes, which are largely invisible in the chromosomes, and it is likely that genes determine the phenotype is not only located on sex chromosomes, but also scattered in the chromosomes of cars. models may lead to abnormal chromosome "non-disjunction during mitosis, when a pair of chromosomes do not separate properly so that an extra chromosome is taken to a cell while a chromosome not found in the cell of another, or separation of one or more abnormal chromosomes can occur. An abnormal chromosome may be fully or partially attached to another chromosome (translocation).

In some individuals abnormal phenotype male (Klinefelter syndrome, seep 64) is the structure of chromosomes XXY, and among them a piece of the chromatin is seen. In other individuals abnormal female phenotype (Turner syndrome, see P. 64) there is only one X chromosome, and no visible nuclear node. In Very Rare cases with mental retardation, but otherwise apparently normal structure female chromosome can XXX and these people have two pieces of chromatin.

Blood tests also proved of great value and interest in research on congenital anomalies and unusual patterns were found in 70 percent of bags for pregnancy miscarriage. Often, the abnormality chromosome is so serious that no embryo is formed.

Already at week 5 of embryo development site of the gonad may be recognized as an area of thickening of the coelomic epithelium on the ventral surface of the mesonephros. amoeboid cells are Genn essential cells migrate to the gonadal development of the region

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