Stern's Introductory Plant Biology
14th Edition
ISBN: 9781259682742
Author: James Bidlack, Shelley Jansky, Kingsley R Stern
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 12, Problem 5DQ
Two mitotic divisions may take place in as little as a few hours; whereas meiosis may take much longer. Can you suggest any reasons for this?
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The repeat expansion appears to occur during meiosis but not mitosis. Why mightthis be true?
An important function of meiosis is to reduce the chromosome number to exactly half.How is this done? What makes such a process necessary?
Why do you think that organisms do not use the first steps of meiosis (up to and including meiotic cell division I) for the ordinary mitotic division of somatic cells?
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- Compare meiotic anaphase I with meiotic anaphase II. Which meiotic anaphase is most similar to the mitotic anaphase?arrow_forwardAt which stage of meiosis are sister chromatids separated from each other? a. prophase I b. prophase ll c. anaphase I d. anaphase llarrow_forwardDuring which phases of the mitotic cycle would the terms chromosome and chromatid refer to identical structures?arrow_forward
- Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?arrow_forwardWe are following the progress of human chromosome 1 during meiosis. At the end of prophase I, how many chromosomes, chromatids, and centromeres are present to ensure that chromosome 1 faithfully traverses meiosis?arrow_forwardThe chromosome constitution number of this individual is 2=6. This drawing represents: a. mitotic metaphase. b. meiotic metaphase I. c. meiotic metaphase II. d. a gamete. e. sixnonhomologous chromosomes.arrow_forward
- If you arrested a human cell in metaphase I of meiosis and applied this technique, what would you observe? How would this differ from what you would see in metaphase of mitosis?arrow_forwardDuring meiosis, cells undergo two rounds of nuclear and cell division, but only one round of DNA synthesis. Describe the main differences between anaphase of mitosis and anaphase I in meiosis. Why are these differences important for meiosis to occur correctly?arrow_forwardObvious differences in the position of chromosome copies are clear during metaphase of mitosis and meiosis. How would you describe these changes?arrow_forward
- Meiotic nondisjunction is much more likely than mitotic nondisjunction.Based on this observation, would you conclude that meioticnondisjunction is usually due to nondisjunction during meiosisI or meiosis II? Explain your reasoning?arrow_forwardAssuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a cell from this organism have immediately after fertilization?arrow_forwardwhy is meiosis important concept in genetics?arrow_forward
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cell division of meiosis and mitosis; Author: Stated Clearly;https://www.youtube.com/watch?v=A-mFPZLLbHI;License: Standard youtube license