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.
Mothers Day. Mother's Day is observed the second Sunday in May. It is a time to honor mothers, grandmothers, and great-grandmothers for their contribution to family and society. Since it is not a federal holiday, businesses may be open or closed as any other Sunday.