sex chromosome
3.X chromosome was the second largest submetacentric chromosome and Y was the smallest acrocentric chromosome in 1 pair sex chromosome.
4.The engraftment analyses included the detection of microsatellite short tandem repeats (STRs), bcr/abl fusion gene, Philadelphia chromosome, HLA-locus analysis, sex chromosome and ABO blood type or blood subtype.
5.mantzorum has well-differentiated XY type sex chromosomes,the Y chromosome is mainly composed of euchromatin,but has strong C-band in the middle of the long arm. It is suggested that the Y chromosome of A. mantzorum is in the initial stage of sex chromosome differentiation.
6.Conclusion Sex chromosome lose is the most frequent extral abnormity of t (8; 21) AML,and is predominantly associated with M2 subtype of AML with unique morphological,immunological and clinical features,
7.Chromosomal prepartions made from peripheral blood lymphocytes were analysed with conventional GTG and CBG banding techniques. We found 16 patients showed numerical structural abnormalities of sex chromosome (32.0%):2 subjects With del(Y)(q11),1 with a large Y(Y+),6 with47,XXY,4 with 47,XXY/46,XY,2 with 46,XY/45,X and 1 with 46,XX.
8.Among the 21 pairs autosomes,the shape type of 17 pairs were metacentric (M),810 pairs were submetacentric (SM),1116 pairs were subtelocentric (ST) and 1721 pairs were acrocentric (T). In the 1 pair of sex chromosomes,the chromosome was submetacentric and the Y chromosome was metacentric. The chromsome karyotype of male rabbit was 44,Y.
9.Heterogametic sex The sex with dissimilar sex chromosomes, one (in mammals the Y chromosome)being shorter than the other(the X chromosome).
10.From the results, we deduce that there are no homologic sequences of whole Y chromosome special DNA sequences of mouse in Y chromosome and whole genome of Microtus mandarinus. Perhaps, there are no important genes which determine male sex in the Y chromosome .
