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.
In the days and weeks before Mother's Day, many schools help their pupils to prepare a handmade card or small gift for their mothers. Mother's Day is not a federal holiday.Organizations, businesses and stores are open or closed, just as they are on any other Sunday in the year. Public transit systems run to their normal Sunday schedules. Restaurants may be busier than usual, as some people take their mothers out for a treat.Read more about Mother's Day. Select another year-range: Mother's Day in the United States is annually held on the second Sunday of May.It celebrates motherhood and it is a time to appreciate mothers and mother figures.n the days and weeks before Mother's Day, many schools help their pupils to prepare a handmade card or small gift for their mothers. Mother's Day is not a federal holiday.