9. The unlettered circle at the top of the figure shows a diploid nucleus with fourchromosomes that have not yet replicated. There are two pairs of homologouschromosomes, one long and the other short. One haploid set is black, and the other is gray.The circles labeled A to E show various combinations of these chromosomes.CentromereDEA) Which drawing represents prophase of mitosis?B) Which drawing represents one daughter nucleus at the end of telophase of mitosis?10. Why do neurons and some other specialized cells divide infrequently?A) They no longer have active nuclei.B) They have entered into G0.C) They only have one set of chromosomes.11. One difference between cancer cells and normal cells is that cancer cellsA) are unable to synthesize DNA.B) are arrested at the S phase of the cell cycle.C) continue to divide regardless if they have the appropriate signals.D) cannot function properly because they can only divide when there is space.12. The spindle checkpoint ensures that all chromosomes are attached to the mitotic spindle. Ifthis does not happen, cells would most likely be arrested inA) telophaseB) anaphaseC) G2D) metaphase

There are two types of cell division: meiosis and mitosis. Mitosis is the equational cell division,…

11. One difference between cancer cells and normal cells is that cancer cells A) are unable to synthesize DNA. B) are arrested at the S phase of the cell cycle. C) continue to divide regardless if they have the appropriate signals. D) cannot function properly because they can only divide when there is space

11. One difference between cancer cells and normal cells is that cancer cells A) are unable to synthesize DNA. B) are arrested at the S phase of the cell cycle. C) continue to divide regardless if they have the appropriate signals. D) cannot function properly because they can only divide when there is space

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter11: Meiosis: The Cellular Basis Of Sexual Reproduction

Section: Chapter Questions

Problem 12TYK: Discuss Concepts One of the human chromosome pairs carries a gene that influences eye color. In an...

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A cell has a diploid number of 12 (2n=12)a) how many chromosomes are present in a daughter cell after meiosis I? b) how many chromatids are present in a daughter cell after meiosis I?c) how many chromosomes are present in a daughter cell after meiosis II? d) how many chromatids are present in a daughter cell after meiosis II? e) how many chromosomes are present in a daughter cell after mitosis?
1. a. In yellow fever mosquitos (Aedes aegypti) 2n=6. In a mosquito cell that is going through mitosis, how many daughter cells are formed and what is the number of chromosomes in each cell? b. Another mosquito cell with 2n=6 undergoes meiosis. How many cells will result from this process, and what is the chromosome number in each cell?
7) Picture a scenario where the maternal and paternal chromosomes randomly align all on the same side (all the maternal chromosomes on one side and all of the paternal chromosomes on the other side). If this happened in your body, this would theoretically result in the production of gametes that contained chromosomes which ALL originated from either your mother or your father. Are the chromosomes contained in these gametes identical to the ones you originally inherited from your mother and father? Why or Why not?
II. A diploid species has 3 pairs of chromosomes in the somatic cells. In males, the first pair is large submetacentric; the second is medium acrocentric, and the third is small telocentric. In females, the first two pairs are like those of the males while the third is large metacentric with satellite. Illustrate the karyograms of the following: a. A triploid cell in femalesb. tetrasomic cell in malesc. tetraploid cell in females
1. A recently discovered bird species was found to have 29 chromosomes in its somatic cells before S phase. a. How many chromosomes (2n) are present in a somatic cell during mitosis? b. How many chromosomes does a bird receive from one parent? c. How many sister chromatids are present during metaphase 2? d. Assuming this species follows the same XX/XY sex differentiation as mammals, how many sex chromosomes are in an unfertilized egg? e. How many pairs of homologous chromosomes would you expect to see lined up during metaphase 2? 2. An onion cell (2n) with 10 autosomes and 2 sex chromosomes is about to undergo meiosis. How many cells will result from this process, and what is the chromosome number and ploidy of each cell? 3. An animal is heterozygous for two autosomal genetic traits found on different chromosomes. Purple fur is inherited dominantly (with pp genotype giving green fur) and the gene is located near the telomere on the short arm of an acrocentric autosome. The gene for…
1. Starting with a “parent” cell that has two homologous chromosomes as pictured below. (diploid), 2n=2 means that this diploid cell has two same-sized, homologous chromosomes. Fill in the circles below. Just draw chromosomes, no spindles or nuclear envelope. “A” and “a” represent alternate alleles of same gene. Use a vertical metaphase plate. Label each cell as haploid (1n) or diploid (2n)= number of chromosomes. 2. There are two pairs of chromosomes in a diploid cell (2n=4). Label the genes and alleles on homologs and sister chromatids. A is on the big chromosome and B is on the smaller chromosome. The genotype is AaBb. Using a vertical metaphase plate, draw the two independent orientations of this AaBb cell in Metaphase I of MEIOSIS. On the lines above, indicate the genes/alleles in the gametes (after cytokinesis II) that would results from that alignment in the circles above (no crossover has occurred). 3. Discuss, agree and indicate the following on this diagram. If the term…
1. What materials provide the substance of a densely staining chromosomes present during mitosis? 2. What hereditary components are the chromosomes believed to carry with them?
1. Your class has been studying cell division in a number of organisms with different chromosome numbers. Unfortunately, the slides showing the different stages of mitosis and meiosis got mixed up, and some of them got lost. The figures below show the 12 slides that you have managed to find. The organism that you have been studying has a 2n number of 8 with one pair of large metacentric chromosomes, one pair of small metacentric chromosomes, one pair of acrocentric chromosomes and one pair of telocentric chromosomes. a. Do any of the recovered slides below show the stages of cell division indicated in the table in the answer sheet? If so, please write only the slide number in the correct place in the table on your answer sheet. b. Consider slide 6 above. What chromosomal event / phase of cell division is being shown here? c. What is wrong with the picture of this stage of cell division?
1. Your class has been studying cell division in a number of organisms with different chromosome numbers. Unfortunately, the slides showing the different stages of mitosis and meiosis got mixed up, and some of them got lost. The figures below show the 12 slides that you have managed to find. The organism that you have been studying has a 2n number of 8 with one pair of large metacentric chromosomes, one pair of small metacentric chromosomes, one pair of acrocentric chromosomes and one pair of telocentric chromosomes. a. Do any of the recovered slides below show the stages of cell division indicated in the table in the answer sheet? If so, please write only the slide number in the correct place in the following, Mitosis, Meosis I and Meosis II. b. Consider slide 6 above. What chromosomal event / phase of cell division is being shown here? c. What is wrong with the picture of this stage of cell division?
Normal mitosis takes place in a diploid cell of genotypeA/a ; B/b. Which of the following genotypes might represent possible daughter cells?a. A ; B b. a ; b c. A ; bd. a ; B e. A/A ; B/B f. A/a ; B/bg. a/a ; b/b
. 1 During which phase of the meiotic cell cycle does DNA replication occur? a. interphase b. prophase c. metaphase d. anaphase e. telophase 2. When does crossover take place in meiosis? a. interphase b. prophase c. metaphase d. anaphase e. telophase 3. During which phase of meiosis does the nuclear membrane reform around chromosomes? a. interphase b. prophase I c. metaphase II d. anaphase I e. telophase II 4. A human cell containing 22 autosomes and a Y chromosome is... a. a somatic cell of a male b. a zygote c. a somatic cell of a female d. a sperm cell e. an ovum 5. Homologous chromosomes move towards opposite poles of a dividing cell during... a. mitosis b. meiosis I c. meiosis II d. fertilization e. binary fission 6. Meiosis II is similar to mitosis in that... a. homologous chromosomes synapse b. DNA replicates before the division c. the daughter cells are diploid d. sister chromatids separate during anaphase e. the chromosome number is reduced 7. Metaphase of meiosis I and…
How many Barr bodies would you expect to see in a human cell containing the following chromosomes? a. XX b. XY c. XO d. XXY e. XXYY f. XXXY g. XYY h. XXX i. XXXX