Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 13.4, Problem 1R
Summary Introduction
To review:
The genetic consequences of an unpaired DNA change in the S phase prior to meiosis.
Introduction:
Cell division refers to the row of events that occur within the cell and the cell travels through different phases of the cycle. Cell cycle is segregated into G1 (Gap 1) phase, G2 phase, S-phase, and finally the mitosis or meiosis phase occur.
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Life: The Science of Biology
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- During which phases of the mitotic cycle would the terms chromosome and chromatid refer to identical structures?arrow_forwardExplain how the random alignment of homologous chromosomes during metaphase I contributes to variation in gametes produced by meiosis.arrow_forwardCompare meiotic anaphase I with meiotic anaphase II. Which meiotic anaphase is most similar to the mitotic anaphase?arrow_forward
- If a muscle cell of a typical organism has 32 chromosomes, how many chromosomes will be in a gamete of that same organism? a.8 b. 16 c. 32 d. 64arrow_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_forwardAt which stage of meiosis are sister chromatids separated from each other? a. prophase I b. prophase ll c. anaphase I d. anaphase llarrow_forward
- Describe the critical events of mitosis that are responsible for ensuring that each daughter cell receives a full set of chromosomes from the parent cell.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_forwardVariations in Chromosome NumberAneuploidy Describe the process of nondisjunction and explain when it takes place during cell division.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_forwardHumans have 46 chromosomes in each somatic cell.a. How many chromosomes does a child receive fromits father?b. How many autosomes and how many sex chromosomes are present in each somatic cell?c. How many chromosomes are present in a humanovum?d. How many sex chromosomes are present in ahuman ovum?arrow_forwardIf a cell has a diploid number of twelve (2N = 12) before meiosis, how many chromosomes will be in each of the four daughter cells if one pair of chromosomes experiences nondisjunction during meiosis I. Explain.arrow_forward
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The Cell Cycle and its Regulation; Author: Professor Dave Explains;https://www.youtube.com/watch?v=eqJqhA8HSJ0;License: Standard YouTube License, CC-BY
Cell Division - Mitosis and Meiosis - GCSE Biology (9-1); Author: Mr Exham Biology;https://www.youtube.com/watch?v=w7vp_uRA8kw;License: Standard YouTube License, CC-BY