Quiz 2 Mitosis/Meiosis part 1
A biologist examines a series of cells and counts 160 cells in interphase, 20 cells in prophase, 6 cells in prometaphase, 2 cells in metaphase, 7 cells in anaphase, and 5 cells in telophase. If the complete cell cycle requires 24 hours, what is the average duration of metaphase in these cells?
2 metaphase / 200 total = .01 x 24 hours = .24 hours average in metaphase
A cell in prophase II of meiosis contains 12 chromosomes. How many chromosomes would be present in a cell from the same organism if it were in prophase I of meiosis?
24 chromosomes
A cell in prophase II of meiosis contains 12 chromosomes. How many chromosomes would be present in a cell from the same organism if it were in prophase of mitosis?
24 chromosomes
All of the following cells, shown in various stages of mitosis and meiosis, come from the same rare species of plant. What is the diploid number of chromosomes in this plant?
6
How does anaphase I of meiosis differ from anaphase of mitosis?
In anaphase 1 of meiosis, homologous chromosomes separate and move towards opposite poles, while the sister chromatids stay together. In anaphase of mitosis, sister chromatids separate and move towards opposite poles.
Are homologous pairs of chromosomes present in mitosis? If so in all phases? Explain your reasoning.
They are always present in diploid cells. They are present in prophase 1 as well as metaphase 1.
All of the following cells, shown in various states of mitosis and meiosis, come from the same rare species of plant. Give the names of each stage of mitosis or meiosis shown for cells 1, 2, and 3. They are all in anaphase but tell me which anaphase and whether I or II of meiosis.
answer: cell 1: anaphase 1 of meiosis cell 2: anaphase of mitosis cell 3: anaphase 2 of meiosis
Do you know of any genetic diseases or disorders that result from errors in mitosis or meiosis? How do errors in mitosis or meiosis bring about these diseases?
cancer is caused when mitosis has no control of the checkpoint that would kill the cell. with the broken checkpoint, the cell continues. the new cells created that are also out of control are cancer cells.
