The result of this union will be a cell with three copies of chromosome 21. Recall again that we've only been considering chromosome 21 so far. Chromosome nondisjunction is generally rare, so the new cell probably has two copies of all of the other 22 chromosomes, just as it should.
When is Mother's Day 2017? Mother's Day 2017 is on Sunday, May 14, 2017 (in 270 days). Mother's Day 2016 has already passed - it was on Sunday, May 8, 2016, 101 days ago.
Mothering Sunday, sometimes known as Mother's Day, is held on the fourth Sunday of Lent. It is exactly three weeks before Easter Sunday and usually falls in the second half of March or early April. Mothers are remembered on Mothering Sunday in the UK. Mothers are remembered on Mothering Sunday in the UK.