Why is Down syndrome more often the result of oogenesis rather than spermatogenesis? - down syndrome more condition_symptoms and physical looks
Spermatogenesis is that chromosomes are evenly distributed, it is difficult to make a mistake. In oogenesis, were expelled 3 small polar body () extra chromosomes. If he can not expel the egg one chromosome 21, and then there is a surcharge on the baby, so that the syndrome.
Down Syndrome More Condition_symptoms And Physical Looks Why Is Down Syndrome More Often The Result Of Oogenesis Rather Than Spermatogenesis?
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Be in the Down's Syndrome is usually caused by advanced maternal age. For some reason, there is an extra chromosome 21 If the mother is greater, sometimes, parts of chromosomes places of witches, who does not really affect the mother, but when the gene for the child that they can influence will be transferred. For example ... that a piece of change of 9 and 21 seats, so this affects the mother because she does not have the exact amount of the individual, but if Mom is number 9, a 21-piece, body probably have 3 21's baby, because the father happens to you, the mother goes into his own, and then another piece of nine of 21 three years ago.
There is also another example where the two conferred 21 years with her mother to child. We do not know why.
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