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... few days in the laboratory to be observed before being placed into the women's uterus. Sometimes additional eggs can be kept and frozen for use later on. Before the eggs are implanted back into the mother's uterus there are a number of things that can be done to manipulate the outcome. It is now possible to select the sex of a child before it is born but this is a very controversial area and isn't commonly practised. However it can be done in a clinic in America for a few thousand dollars. There are many techniques used to determine the sex of the child. Male and female sperms have different masses and therefore can be separated by 'centrifuging the sperms through viscous solutions' (Leese 1988 p 62). Another widely known technique is 'microsort'. The sperms' heads, containing the DNA, are marked with a fluorescent dye, which attaches itself to the DNA; they ...