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.
Mother's Day in Mexico: In the North American country of Mexico, Mother's Day is celebrated on a fixed day of May 10 as opposed to the Mother's Day in US that falls on the second Sunday in the month of May. Mother's Day in Mexico is celebrated in a colorful fashion.