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The main outcome measure of this study, which was performed by Dr Christos Venetis from the University of New South Wales and colleagues at IVF Australia, was the number of chromosomally normal ("euploid") embryos identified by preimplantation genetic screening (PGS) in more than 700 treatment cycles at three IVF centres.
Reduced fecundity of heterozygotes, through the production of chromosomally unbalanced gametes in small isolated demes, is an assumption common to most models of chromosomal speciation including the cascade model (Sites and Moritz 1987; Hall 1983).
Reduced susceptibility to cephalosporins is chromosomally mediated, and the mechanisms resemble those for chromosomally-mediated penicillin resistance.
If you transfer to the uterus embryos that are confirmed to be chromosomally normal and develop well, reaching the blastocyst stage, the chance of producing a child is very high, about 70percent.
Maternal serum ADAM12 (a disintegrin and metalloprotease) in chromosomally abnormal pregnancy at 11-13 weeks.
Further investigation of other technical limitations, such as the high rate of mosaicism, has revealed that, when two cells are examined and found to be karyotypically discordant, further analysis of the entire embryo will reveal that more than 50% of embryos are, in fact, euploid--that is, chromosomally normal.
The genes responsible for MBL production may be chromosomally or plasmid mediated and hence pose a threat of spread of resistance by gene transfer among the Gram-negative bacteria (3).
But the UK scientists have pioneered a new high-tech test which can detect all the chromosomes and genes and identify embryos that are chromosomally "normal" and therefore have the best chance of becoming a baby.
It may also be due to changes in attitudes towards termination of chromosomally abnormal fetuses, said Dr.
An oft-cited example of ongoing chromosomally mediated speciation is the Sceloporus grammicus complex of central Mexico (White 1978; Hall 1983; King 1993).
hispidus appears to be the most chromosomally divergent species examined.
Likewise, second day intracytoplasmic sperm injection in these same high risk patients failed to yield chromosomally normal embryos; suggesting that the technique of second day ICSI should not be employed with patients with high risk.

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