Essays on Sister Chromatids

1. Explain in general terms the process of DNA replication. DNA replication refers to the process whereby DNA makes its own copy during the process of cell division. During this process, the DNA strands unzip themselves since helicase enzyme breaks the hydrogen bonds between the complementary strands. As this occurs, a replication fork is created. Each individual strand (leading and lagging) will be used as templates. A primer attaches itself to the leading strand and the synthesis of DNA begins, whereby DNA polymerase adds nucleotides to the synthesized strand. This is a continuous process and occurs in 5’ to ...

A General Outlook on Meiosis and Mitosis Processes

Compare and contrast mitosis and meiosis. Think phases, starting and ending products, chromosome numbers, the purpose of each, and the cell types that complete each type of division. Be sure to do a DIRECT compare and contrast, and write in paragraph form - Mitosis involves one cellular division resulting in identical daughter cells while meiosis involves two cellular divisions resulting in different daughter cells. Meiosis produces four haploid cells while mitosis produces two diploid cells- this ensures genetic diversity by sexual reproduction in meiosis and cellular reproduction and production of general growth products in mitosis. The chromosome number also ...

Q1. Explain the regulation of the cell cycle

Every cell is regulated by particular checkpoints to ensure that the daughter cells are exact duplications. This is to help guarantee that cell mutations are not passed on to the next generation of cells. In eukaryotic cells, there are three main checkpoints. These are points at which cell replication can be halted until certain conditions are met (Boundless, 2016). The first checkpoint is near the end of the G1 phase. It is here that DNA gets evaluated and checked for damage. If damage has occurred, it either gets corrected or gets prevented from moving on to the next phase ( ...