A scientist is studying cells is trying to determine the length ofthe various st
ID: 3183 • Letter: A
Question
A scientist is studying cells is trying to determine the length ofthe various stages in mitosis and the cell cycle. Thescientist examines 800 cells and finds 128 cells in prophase, 60cells in metaphase, 32 cells in anaphase, and 48 cells intelophase.a. What percentage of the cell cycle is spent in each stage,including interphase? Assume that the cells are sampled inproportion to the duration of each stage in the cell cycle. Show work.
Here's how I did:
prophase: (128/800) * 100%= 16%
metaphase: (60/800) * 100%= 7.5%
anaphase: (32/800) * 100%= 4%
telophase: (48/800) * 100%= 6%
Thus, total time spent in mitosis is 33.5% of cell cycle. Therest of the time (66.5%) is spent on interphase.
b) Assume that the entire mitotic process takes place in one hour,how many hours long is one entire cell cycle?
Here's how I did it:
60 minutes * 0.335 (the time spent in mitosis)= 20 minutes.
c) This species is diploid, with 9 chromosomes in eachgamete. If the haploid concentration of DNA is designated by"Q", describe the number of chromosomes and the amount of DNApresent in the cell at the end of each stage of interphase.
I am stuck on this one. Need help. Thanks.
Explanation / Answer
Part B is incorrect. Mitosis takes 60 minutes and is 33.5percent of the cell cycle. Divide 60 minutes by 33.5 to get1.79 minutes per percent of the life cycle. Times 100 gives you thetime for 100% of the the life cycle which is 179 minutes, nearly 3hours. c) Chromosome # [DNA] G1 18 2Q (there would be no sister chromatids) S 18 4Q (there would be sister chromatids) G2 18 4Q (no DNA replication has taken place)
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