Consider the time period that starts when a cell is \"born\" and ends when the c
ID: 87108 • Letter: C
Question
Consider the time period that starts when a cell is "born" and ends when the cell divides. Approximately what percentage of this time is devoted to interphase? Say that you look at the nuclei of 100 skin cells taken from the same person. About how many of these skin cells would you expect to be in interphase? Think about a group of cells that are undergoing very frequent cell divisions (e.g. cells that are part of a growing embryo). Suppose that you looked at 100 of these cells. How many of these cells would you expect to be in interphase? Circle your answer. More than the number from part e QR Less than the number from part e Explain your answer to part f. In your own words, explain the difference between mitosis and meiosis (focus more on the final results, instead of the details of each individual sub-phase). How are mitosis and meiosis similar?Explanation / Answer
Answer: d) When a cell gets its birth, from that nascent stage till it dies off it has got to see 3 main stages of the cell cycle. Cycles are interphase, mitosis, and cytokinesis. Then calculating its whole lifetime we come to know that they spend their most of their lives, about 78 percent of the time, in the Interphase, that is in non-dividing stage.
For a single celled organism this determination is how quick it can reproduce, the stage of its cell cycle. Just in case of prokaryotes, they have smaller genomes and they have to divide fast, another case for embryonic cells they often omit the G1 and G2 phages of cell cycle. G2 is a shorter span, only 3-4 hours and the most part it acquires with the interphase, generally takes between 18 and 20 hours.
e) The 100 new cells taken from a person and containing nuclei means the cells is in interphase. We can recall when the mitosis and cytokinesis occurs, cells nulcei are disrupted, other than that cells are in G1, S or G2 phase, that comes under the Interphase. If cells are from the actively growing stages in a cell cycle, they are still be determined by the cell function. As mitosis and cytokinesis only takes place between 3-4 hours, so most of the time is for interphase. Here we can assume 90% of the cells are in interphase.
f) 30 cells are in interphase, which is way different from the previous results.
g) An actively growing cell stage is after the G0 phase, cells enters into the G1 phase, here they encounter a longer period, after this the synthesis phase. IF the cells are actively dividing, so that they in the G2 phase or beyond where the mitosis takes place and cells are separated. Then we can predict the cells to be in M phage and cytokinesis, this is the just the opposite of the interphase. Here the 100 cells would be more in M phase than in Interphase. Here the 90% of the cells would be in actively dividing, so the interphase would be containing around 30 % of the cells.
2) Cell division mechanism is supported by the two basic modes of cell division, one is Mitosis and another is meiosis.
Mitosis is useful foe cell divisions in somatic cells, here the parent’s cell as 2n number of chromosome gives rise to same number with two daughter cells. The chromosome numbers remains same.
In case of Meiosis, this occurs in the sex cells, the sperm and ovum. Here the cells division progresses in two phases. First the Meiosis I, mother and father cells give rise to 2 daughter cells with half the number of chromosomes, and then the Meiosis II, where 4 daughter or progeny cells comes up.
Difference in thus in chromosome number and the number of cells produced.