18- During which part of the cell cycle does the cell grow in size and prepares
ID: 80420 • Letter: 1
Question
18- During which part of the cell cycle does the cell grow in size and prepares for DNA synthesis? spLase Cas phase 19. During which part of the cell cycle does the cell replicate its genetic material? S thase 20- Why is the G1 checkpoint extremely important? 21- During which part of the cell cycle does the cell check that the DNA is ready and the cell is ready for nuclear division? 22-What two molecules are primarily responsible for regulating the cell cycle? and 23- What is the difference between a haploid and diploid cell?Explanation / Answer
18.There are three phases in a cell cycle . G1, S, G2 phases . All these phases have their equal values in cell cycle.
Answer is G1 because this stage helps the cell in growth and preparethe cell for DNA replication by preparing all macromolecules like carbohydreates , proteins and other factors needed for cell growth and DNA preparation.
19.During S phase a cell doubles its DNA content . This process is called DNA replication.
20. G1 checkpoint is necessary because it checks all condition of cell if condition are not proper then it doesl not allow cell to start DNA replication .
21 G2 checkpoint check the DNA replication if there is any discrepencey in DNA then G2 point does not allow cell to enter in next phase that is M phase.
22.Cyclin and Cyclin dependent kinase (CDK)are needed to regulate the cell cycle.
23. Haploid cell have single set of chromosome of a species and diploid cell have double set of chromosome. for example in human haploid cell contain 23 chromosomes and diploid cell contain 46 chromosome.
24. In male meiosis occur in testes and in female meiosis occur in ovaries.
25. two copies of a genes called allele.
26. mitosis occur in somatic cells and meiosis occur in germinative cells.
Mitosis is equational division while meiosis is reductional division.
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