Q4. The cell cycle is controlld af three checkpoints Gl, G2, and M. A number of
ID: 189976 • Letter: Q
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Q4. The cell cycle is controlld af three checkpoints Gl, G2, and M. A number of events must be miet in order for the cell to successfully pass the checkpoint. Table 1 (below) lists some of these events. For each event determine if it occurs in the G1, G2, or M checkpoint (or more than one) by placing a check mark () in the box underneath the heading of the checkpoint. Table 1 Events associated with the cell checkpoints. Gl checkpoint G2 checkpointM checkpoint Events All chromosomes are attached to spindle microtubules High intracellular levels of maturation promoting factor (MPF) are present Chromosomes have been replicated successfully Assessment of DNA damage Increase in cell sizeExplanation / Answer
7. Each type of cell has different shape, size etc.Prophase of mitosis is the stage of cell cycle in the plants and animal cells.
12. Meiosis leads to genetic diversity:
Meiosis is the process by which most eukaryotic organisms with cells having an organised nucleus, produce sex cells, male and female gametes.Cells normally have two chromosomes one donated from each parent. This is called diploid chromosome and the paired chromosomes are called homologous.Meiosis transforms a diploid cell into for haploid grand daughter cells having a single pair of each chromosome.
Crossing over- In prophase of meiosis 1, double chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments.
Reduction to haploid- each daughter cells recieve only one chromosome of each homologous pair due to duplicated chromatid which remain joined during meiosis 1.
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