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DNA and Manipulating Reproduction If 100 fertilised eggs were planted in 100 females uteri at the correct time in their menstrual cycle, only 18 of these eggs would be born. At a certain point during a female's menstrual cycle, blisters form within the uterus and mucus is then secreted. The gene that produces this mucus is MUC1 - the mucin gene. This mucus and therefore this gene, is associated with breast cancer, which therefore means that a mutated mucin gene could contribute or be a cause of breast cancer. A normal fertile female has 5.5 kilobases. Although rare, some females can have just 3.5 kilobases. This affects the lining of the uterus ultimately resulting in infertility as the uterus becomes inhospitable. Fertility declines with age, as the uterus becomes more inhospitable. Moreover, many more eggs/embryo's have severely mutated chromosomes as either a result of a mutated mother egg/cell, or as a result of...

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