Medical Genetics In Down syndrome, 95% of al cases are caused by this event: one cell has two 21st chromosomes instead of one, so the resulting fertilized egg has three 21st chromosomes hence the scientific name, trisomy 21. Recent research has shown that in these cases ormal approximately 90% of the abno cells are the eggs
Medical Genetics In Down syndrome, 95% of all cases are caused by this event: one cell has two 21st chromosomes instead of one, so the resulting fertilized egg has three 21st chromosomes. Hence the scientific name, trisomy 21. Recent research has shown that in these cases, approximately 90% of the abnormal cells are the eggs
Medical Genetics The cause of the nondisjunction error isn 't known but there is definitely connection with maternal age. Research is currently aimed at trying to determine the cause and timing of the nondisjunction event
Medical Genetics The cause of the nondisjunction error isn't known, but there is definitely connection with maternal age. Research is currently aimed at trying to determine the cause and timing of the nondisjunction event
Medical Genetics dEo24,X,+21 Down D syndrome 目目47,XX+21 自 (TDo 23, x 2122X _=D
Medical Genetics
Medical Genetics (》( ?# 6 ?3:2 4 10 t 2 2 Y
Medical Genetics
Medical Genetics Three to four percent of all cases of trisomy 21 are due to Robertsonian Translocation. In this case, two breaks occur in separate chromosomes, usuall the 14th and 21st or 21st and 22st chromosomes. There is rearrangement of the genetic material so that some of the 14th chromosome is replaced by extra 21st chromosome
Medical Genetics Three to four percent of all cases of trisomy 21 are due to Robertsonian Translocation. In this case, two breaks occur in separate chromosomes, usually the 14th and 21st or 21st and 22st chromosomes. There is rearrangement of the genetic material so that some of the 14th chromosome is replaced by extra 21st chromosome