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 biggest airline in the world, measured by number of passengers, is not even among the top five airlines here. It is still the most international airline based in the United States, which is a claim to fame. Sort of. Delta is based in Atlanta, the worldâs busiest airport with over 88 million passengers every year.