If there are 20 chromatids in a cell, how many centromeres are there?
Correct answer: A. 10
- A. 10
- B. 20
- C. 30
- D. 40
Explanation
If there are 20 chromatids in a cell, it means that these chromatids are derived from 10 chromosomes. Each chromosome has two sister chromatids, so the total number of centromeres can be determined by dividing the total number of chromatids by 2.Number of centromeres = Total number of chromatids/2Number of centromeres = 20/2 = 10 So, if there are 20 chromatids in a cell, there are 10 centromeres.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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