The answer is 20. Duplicated chromosome has two sister chromatids, identical copies of the chromosome. These two chromatids are joined at the region called centromere. Therefore, one duplicated chromosome has one centromere and two sister chromatids. If there are 20 duplicated chromosomes in a cell, there will be 20 centromeres.
The biggest airlines flying to United States: American Airlines flights to United States, Delta flights to United States, Southwest Airlines flights to United States. Regions in the USA - United States. Airlines flying to the USA - United States - by city.
The Boeing 737 is the most common jet airplane in the world. For our example here Iâm going to use one type of Boeing 737, the 737-700. A full 737-700, including 180 passengers (and I assume .5 checked bags and one carry-on per passenger), can fly 4,300 miles (New York to Phoenix roundtrip) on 6,900 gallons of fuel.