GENDER RESEARHES – 2
Another researchers have claimed that a preponderance of boys are conceived if intercourse takes place 4 or more days before ovulation, or the opposite, 2 or more days after ovulation. A criticism of the reports of these scientists is that their method of pinpointing ovulation was rather inaccurate. The conclusion is that at present a couple cannot choose the sex of their baby.
There is some interesting work which may let you do this in the future. It has been found that if you add a dye called quinacrine to a specimen of semen, about 45 per cent of the sperms show a glowing spot when they are put under fluorescent light. There is evidence that this glowing spot (sometimes called the ‘firefly’ test) is associated with a Y chromosome. Unfortunately, to do the test means killing the sperm, but it has enabled scientists to stu4y the glow-spot sperms. One finding, which is contrary to Dr Shettles’s beliefs, is that Y sperms do not regularly migrate more rapidly when in an alkaline environment, nor are the glow-spot Y sperms regularly more active in so far as they migrate further and more quickly. But some scientists have found that the male sperms sometimes migrate more quickly in an acid environment. In a series of experiments, Dr Ericsson found that if he put a natural substance called serum albumin in a long tube, added semen, and then centifuged the tube, more Y-carrying sperms were found further up the tube. The sperms which had migrated furthest were more uniform in shape than the rest of the sperms, but most of them were exhausted and, when examined, had very poor motility. Other workers have, repeated the experiment but have been unable to reproduce Ericsson’s work.
In 1979 a group of doctors in Chicago modified Ericsson’s method. They used semen produced by masturbation. This is placed in a test-tube which contains in different layers two concentrations of albumin obtained from human blood serum. The semen is placed on the surface of the top layer. The sperms swim down through the layers towards the bottom of the tube. The doctors have found that more Y-bearing sperms than X-bearing sperms reach the bottom. The bottom layer is separated from the other layers and used to inseminate the woman. Of forty-five women treated in this way, using their husband’s semen, fourteen have become pregnant. Seven women have given birth to boys and one woman aborted a male foetus. The,numbers of boys born are small and not significantly better than chance, but with further experiments it may eventually be possible to choose the sex of your child – but that is in the future.
At the present time, chance determines whether you have a male or a female baby.
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