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Ch. 2 - Mitosis and Meiosis
All textbooksKlug 12th EditionCh. 2 - Mitosis and MeiosisProblem 27
Chapter 2, Problem 27

For Problems 25–30, consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text. Are there any possible combinations present during prophase of meiosis II other than those that you drew in Problem 26? If so, draw them.

Verified step by step guidance
1
Identify the stage of meiosis II: Prophase II is the stage where the cell prepares for the second meiotic division, and the chromosomes are already replicated from meiosis I.
Recall the outcome of meiosis I: At the end of meiosis I, homologous chromosomes are separated, resulting in two haploid cells, each with chromosomes consisting of two sister chromatids.
Consider the chromosome combinations: Since the cell is haploid after meiosis I, each cell contains one chromosome from each homologous pair (e.g., A^m or A^p, B^m or B^p, C^m or C^p).
Determine possible chromatid arrangements: In prophase II, the sister chromatids are still paired, so consider the combinations of chromatids that could be present, such as A^mA^m, B^pB^p, C^mC^m, etc.
Explore different combinations: Since meiosis I results in different combinations of maternal and paternal chromosomes, consider all possible arrangements of chromatids in the haploid cells during prophase II.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Mitosis

Mitosis is the process of cell division that results in two genetically identical daughter cells, each with the same number of chromosomes as the original cell. It involves several stages: prophase, metaphase, anaphase, and telophase, where chromosomes are replicated and evenly distributed. Understanding mitosis is crucial for recognizing how cells replicate and maintain genetic continuity.
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Mitosis Steps

Meiosis

Meiosis is a specialized form of cell division that reduces the chromosome number by half, resulting in four genetically diverse gametes. It consists of two rounds of division: meiosis I, where homologous chromosomes are separated, and meiosis II, which resembles mitosis. This process is essential for sexual reproduction and contributes to genetic variation through independent assortment and crossing over.
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Meiosis Overview

Chromatid Pairing and Synapsis

Chromatid pairing occurs when replicated chromosomes align closely during cell division, particularly in meiosis. Synapsis is the process during prophase I of meiosis where homologous chromosomes pair up and exchange genetic material through crossing over. Understanding these concepts is vital for analyzing chromosomal combinations and genetic diversity during meiosis.
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Chromatin
Related Practice
Textbook Question
A woman who sought genetic counseling is found to be heterozygous for a chromosomal rearrangement between the second and third chromosomes. Her chromosomes, compared to those in a normal karyotype, are diagrammed to the right. Using a drawing, demonstrate how these chromosomes would pair during meiosis. Be sure to label the different segments of the chromosomes.
296
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Textbook Question
For Problems 25–30, consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text. In mitosis, what chromatid combination(s) will be present during metaphase? What combination(s) will be present at each pole at the completion of anaphase?
361
views
Textbook Question
For Problems 25–30, consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text. During meiosis I, assuming no crossing over, what chromatid combination(s) will be present at the completion of prophase I? Draw all possible alignments of chromatids as migration begins during early anaphase.
353
views
Textbook Question
For Problems 25–30, consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text. Draw all possible combinations of chromatids during the early phases of anaphase in meiosis II.
296
views
Textbook Question
For Problems 25–30, consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text. Assume that during meiosis I none of the C chromosomes disjoin at metaphase, but they separate into dyads (instead of monads) during meiosis II. How would this change the alignments that you constructed during the anaphase stages in meiosis I and II? Draw them.
355
views
Textbook Question
For Problems 25–30, consider a diploid cell that contains three pairs of chromosomes designated AA, BB, and CC. Each pair contains a maternal and a paternal member (e.g., A^m and A^p). Using these designations, demonstrate your understanding of mitosis and meiosis by drawing chromatid combinations as requested. Be sure to indicate when chromatids are paired as a result of replication and/or synapsis. You may wish to use a large piece of brown manila wrapping paper or a cut-up paper grocery bag for this project and to work in partnership with another student. We recommend cooperative learning as an efficacious way to develop the skills you will need for solving the problems presented throughout this text. Assume that each gamete resulting from Problem 29 fuses, in fertilization, with a normal haploid gamete. What combinations will result? What percentage of zygotes will be diploid, containing one paternal and one maternal member of each chromosome pair?
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