If two ancestors with Downs Syndrome have a child, how many copies of chromosone 21 would he/she own?
Answers:
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The 3 chromosomes would replicate once (they other only replicate once) and respectively egg/sperm could have any 1, 2, or 3 chromosomes depending on how the segregate during meiosis. 3 chromosomes can't segregate normally (1 to respectively like you seize when there are solitary 2). So you can get different combinations. You can go and get 2,3,4,5, or 6 chromosomes. There's also the chance that adjectives 3 remain together and so one sperm/egg gets no copy and the solely copy(ies) would be from the other. So there are oodles combinations. Any baby that survives would any have 2 (the regular amount) or would have 3 and hold downs syndrome as well. There are plenty of downs syndrome parents who own 'normal' children. Any more copies than 3 would create severe abnormalities contained by the child and that pregnancy would never make it to occupancy. Other trisomies besides Downs (3 copies of 1 chromosome only live a few months after birth). Having extra chromosomes and so extra dosages of the genes is terribly detrimental.Can people develop "wandering eye"?
depends, mostly the child would own normal chromosomes-why are you trying (and failing) to be funny or are you truthfully interested?