Six studies have analyzed the sperm of 10 XYY patients and, although these studies indicated some degree of elimination of the extra Y chromosome during spermatogenesis, a certain percentage of XYY germinal cells may also be able to achieve meiosis and produce sperm with gonosomal disomies. All...
It is suggested that the absence of sperm cells in specimens with the entire AZFb and with AZFb-c deletions is accompanied by meiosis impairment, perhaps as a result of the extent of the deletion or because of the absence of genes that are involved in the and Y chromosome alignment. 展开 ...
SUMMARYChromosome studies were done on 315 out of 342 men at the State Hospital, Carstairs, Scotland, a hospital for the treatment of patients with dangerous, violent, or criminal propensities in contitions of special securtiy. All but ten of the men in the hospital had a criminal record and...
Rodents with no Y chromosome The good news is we know of two rodent lineages that have already lost their Y chromosome – and are still surviving. The mole voles of eastern Europe and the spiny rats of Japan each boast some species in which the Y chromosome, and SRY, have compl...
which are associated with Klinefelter syndrome.Klinefelter syndromeis a chromosomal condition that occurs when a male is born with an extra X chromosome, resulting in the XXY configuration instead of the typical XY configuration. This condition affects about 1 in 500 to 1 in 1,000 males and can...
Analysis of sex chromosome disomy and diploidy rates in sperm. Both patients had a 47,XYY/46,XY karyotype. The hyperdiploidy rate of patient 1 was 19% and that of patient 2 was 90%. The incidence of disomy XY was significantly elevated in both patients compared with the controls (0.23% ...
The karyotype of the normal man is 46,XY. It is known that the Y chromosome implies the presence of testicular tissue in individuals possessing this chromosome. Males with a karyotype identical to that of the normal woman (46,XX) do, however, exist. XX men are rare, about 1 in 10,000...
and the XY transposed region (88–92 Mb on X, 2.5–6.5 Mb on Y). The method is calibrated to detect mosaicism when the proportion of affected cells is above 10%. We then plotted the values of the mLRRY signals for males and females. A signal from chromosome Y in females is ...
The Conversation notes that there's been plenty of changes to the Y chromosome over the years. Our sex chromosomes were originally a pair of typical XY chromosomes, a trait still observed in birds and reptiles. Even in metronome mammals, like platypuses and echidnas, XY chromosomes are ordinary...
The poor Y chromosome is also at a disadvantage because it is in the testis every generation. This is a dangerous place to be because cells must divide many times to make sperm, so mutations are much more frequent. Discover the latest in science, tech, and space with over100,000 subscribe...