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.
exists and is an alternate of . Southwest Airlines is currently the largest air carrier that flies out of Hobby Airport in Houston, Texas. Delta Air Lines, American Airlines, Air Tran Airlines, and JetBlue Airways are the four other air carriers that service the U.S. destinations only airport.