Can there be mitosis without DNA replication in S phase?
Mitotic cell division cannot take place without DNA replication in S phase. Two important events take place during S phase – one is the synthesis or duplication of DNA and the other is the duplication of the centriole. DNA duplication is important as it maintains the chromosome number in the daughter cells. Mitosis is an equational division. Therefore, the duplication of DNA is an important step.
1. The age of a tree can be determined more or less accurately by
4. Which one of following is not a endocrine gland?
5. The tusk of elephant is an enormously enlarged :
6. Estimatin of age of woody plant by counting annual ring is-
7. Number of stomata is less and sunkin in-
8. What do eukaryotic cells have that prokaryotic cells do not?
10. Question 17:Explain the role of tapetum in the formation pollen-grain wall.