Down Syndrome (trisomy 21) is caused by an error in meiosis which results in the presence of three chromosome #21s in the individual affected. In what two phases of meiosis could this error occur and, in general, HOW does it occur? 2. You are exploring a new planet when you discover a hexaploid (6n) organism. What is the ploidy of the gametes of wheat after meiosis and cytokinesis (what does 6n become)? 3. If a somatic cell has a diploid number of 4, what would be the result in the final daughter cells after cytokinesis IF in Anaphase, one of the chromosomes did not have a separation of sister chromatids? That is, if the sister chromatids of ONE of the chromosomes stayed together, what would be the chromosome number of each daughter cell?

Down Syndrome (trisomy 21) is caused by an error in meiosis which results in the presence of three chromosome #21s in the individual affected. In what two phases of meiosis could this error occur and, in general, HOW does it occur? 2. You are exploring a new planet when you discover a hexaploid (6n) organism. What is the ploidy of the gametes of wheat after meiosis and cytokinesis (what does 6n become)? 3. If a somatic cell has a diploid number of 4, what would be the result in the final daughter cells after cytokinesis IF in Anaphase, one of the chromosomes did not have a separation of sister chromatids? That is, if the sister chromatids of ONE of the chromosomes stayed together, what would be the chromosome number of each daughter cell?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter13: Modern Understandings Of Inheritance

Section: Chapter Questions

Problem 3VCQ: Figure 13.6 Which of the following statements about nondisjunction is true? Nondisjunction only...

See similar textbooks

Similar questions

1. How does meiosis I differ from mitosis? What about meiosis II from mitosis? difference between meiosis l and mitosis? difference between meiosis ll and mitosis? 2. What is the relationship between meiosis and fertilization? 3. If cell division during gametogenesis is non-meiotic, what is its consequence to the future generations of diploid organisms? 4. How does non-disjunction in meiosis lead to numerical chromosomal aberration?
1. What is meiosis?2. What specific cells in the body divide through this process?3. Meiosis involves two successive cell divisions. Which of the two is mitotic in nature? Why?4. What particular event in meiosis results to genetic variation? Why?5. Is there a possibility that a problem may occur at any stage of meiosis? If so, what is it and how does itaffect the organism?6. The cells produced after meiosis are haploid, how do these cells restore or maintain the normalchromosome number of the species?7. Why do you think mitosis and meiosis important in the life cycle of an organism?
5.)Gametogenesis, or the formation of gametes, occurs when diploid germ cells undergo meiosis. In fruit flies (Drosophila melanogaster), diploid germ cells contain eight chromosomes. Which of the following correctly describes the number of chromosomes in the daughter cells produced during gametogenesis in fruit flies? The daughter cells each contain four chromosomes after meiosis I and four chromosomes after meiosis II. The daughter cells each contain eight chromosomes after meiosis I and eight chromosomes after meiosis II. The daughter cells each contain eight chromosomes after meiosis I and four chromosomes after meiosis II. The daughter cells each contain four chromosomes after meiosis I and two chromosomes after meiosis II.
1. What happens during crossing over? Why is “recombination” an alternative term for what happens during the process of crossing over? Does it occur during mitosis? If so, when? If not, explain why not. Does crossing over occur during meiosis? If so, when? If not, explain why not. How does crossing over influence the genetic diversity of gametes?
If both chromatids in meiosis II move to the same pole in one of the two dividing cells, what will be the “ploidy” of the gametes? A. All four gametes will have n chromosomes. B. Two gametes will have n chromosomes, one will have n+1 chromosomes, and one will have n-1 chromosomes. C. Two gametes will have n+1 chromosomes, and two will have n-1 chromosomes. D. All four gametes will have 2n chromosomes.
1. Your father received 23 chromosomes from his mother and 23 chromosomes from his father. How many of your paternal grandfather’s chromosomes did you receive? 2. Enlargement of the spermatogonium and oogonium can be observed in the period of maturation. True or False? 3. Why do gametes contain one of each kind of chromosome? a. Crossing over occurs during prophase I. b. Only one replication of DNA occurs during meiosis. c. The homologous chromosome separate during meiosis. d. The parental cells contain only one of each kind of chromosome. 4. In what period wherein prolonged prophase is the particular process involved? a. period of growth b. 1st reduction division c. period of multiplication d. 2nd reduction division 5. If a cell has 12 chromosomes, how many chromosomes will each of the daughter cells have after mitosis? 6. Somatic cells contain haploid number of chromosomes and undergo mitosis. True or Flase? 7. In which of the following period wherein primary ovocytes are produced?…
2) A. Explain how polyribosomes form. B. Why might you expect the insertion of 3 DNA base pairs to be less disruptive than th deletion of a single base pair? C. Compare and contrast mitosis and meiosis with respect to their genetic outcomes? D. What are the possible consequences of non-disjunction during cell division? E. How does meiosis increase genetic diversity in populations?
1、During prophase I of meiosis, a homologous pair of synapsed chromosomes is called ____ and consists of___chromatids? A 、a chiasma; 4 B、a bivalent; 2 C、a tetrad;4 D、a chiasma; 2
1. List three ways in which mitosis differs from meiosis. Be specificMITOSIS MEIOSIS1. 2. 3. 2. What would happen to the chromosome number in gametes and offspring if gametes were formed by the mitotic process instead of the meiotic process?
1.Why are organisms that have only a single set of chromosomes (haploid) often more favorable for genetic experiments than those having two sets (diploid)? 2. A cell of genotype Aa undergoes meiosis. What will be the genotype(s) of the daughter cells if all of them are functional?
2. A plant has species has a diploid of chromosome number 18. How many chromosome would beexpected in a:a. Triploid? ________b. Trisomic? ________c. Double Trisomic ? ________
If a diploid organism has 14 chromosomes (2n=14) a. How many chromosomes will its gametes have? b. After meiosis I during gamete formation, how many chromosomes are in each daughter cell? c. After meiosis I during gamete formation, how many chromatids are in each daughter cell?