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- 1. Meiosis practice with ascospores The life cycle of the fungus Sordaria fimicola begins in the haploid state. After two different types of strains combine, they develop a diploid nucleus. As the life cycle continues, the diploid nucleus undergoes meiosis (2 cell divisions, remember?) followed by mitosis (a trick the fungi do to make more mileage out of the mating). This produces eight haploid ascospores which are stored in a sac called an ascus. The spores line up in a way that shows these cell divisions. After the spores have matured, the sac will burst, allowing the ascospores to be released. These spores are haploid and thus begin the life cycle again. Sordaria fimicola is often used to observe crossing over because the wild type strain has black ascospores and the mutant type has tan ascospores. When a combination of the two strains go through meiosis, the location of the ascospores will directly show if crossing over has occurred. The below pictures shows a fruiting body with…A sexually reproducing organism has the following phenotype DdEeAaTt: The D and E loci are on the same arm of a metacentric chromosome in cis configuration. The A locus is on the long arm of an acrocentric chromosome and the T locus is on a telocentric chromosome. There are no other chromosomes. 1. What is the haploid number of this organism? 2. Using diagrams, show a cell at metaphase of mitosis and show the results of mitosis. Ensure you show the location of the gene loci on the different chromosomes.Chiasmata: a. form during metaphase II of meiosis. b. occur between two nonhomologous chromosomes. c. represent chromosomes independently assorting. d. are sites of DNA exchange between homologous chromatids. e. ensure the resulting cells are identical to the parent cell.
- Alternation of generations describes which of the following? The haploid form can be multicellular; the diploid form is unicellular The haploid form is unicellular; the diploid form can be multicellular Both the haploid and diploid forms can be multicellular Neither the haploid nor the diploid forms can be multicellular.Figure 24.14 Which of the following statements is true? A dikaryotic ascus that forms in the ascocarp undergoes karyogamy, meiosis, and mitosis to form eight ascospores. A diploid ascus that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A haploid zygote that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A dikaryotic ascus that forms in the ascocarp undergoes plasmogamy, meiosis, and mitosis to form eight ascospores.A cell has a diploid number of 6 (2n = 6). a. Draw the cell in metaphase of meiosis I. b. Draw the cell in metaphase of mitosis. c. How many chromosomes are present in a daughter cell after meiosis I? 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? f. How many pairs of homologous chromosomes are visible in the cell in metaphase of meiosis I?
- Alternation of generations means that plants produce: only haploid multicellular organisms only diploid multicellular organisms only diploid multicellular organisms with single-celled haploid gametes both haploid and diploid multicellular organisms22. Ovary II. Altemate response C. If statement A is correct and B is wrong. D. If statement A is wrong and B is correct. A. f both statements are correct. B. If both statements are wrong. gium in tho anther contains numerous microsporocytes which will undergo1. 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? What problems might be caused by this happening?
- Provide the following information 1. One intrinsic factor that causes mutation. 2. Type of mutation that runs in the family. 3. Euploidy type in humans. 4. Advantage of tetraploid plants over triploid. 5. Aneuploidy is usually caused by what cell cycle event?16. The diagram below shows a phase in meiotic cell division. 小 In which phase does this process occur? A. Metaphase I B. Anaphase I C. Metaphase II D. Anaphase II 17. The graph shows the change in the quantity of DNA in a cell during a reduction division (meiosis). quantity of DNA /arbitrary units 2- time A cell with one pair of chromosomes (2n = 2) undergoes meiosis. Which nucleus is formed as a result of this division? A D Рage 7 | 23All of the following could be deduced from the table except CRITERIA MITOSIS MEIOSIS 1. No. of nuclear division 2. Synapsis/crossing over 3. Centromere of sister chromatids at anaphase 4 No. of daughter cells 5. No. of chromosomes per daughter cell 6 Function I. The mother cell in mitosis divides only once, while the mother cell in meiosis divides twice. II. Synapses only takes place in meiosis. III. Centromere of sister chromatids at anaphase separate in both mitosis and meiosis. The number of daughter cells in mitosis is 2, while meiosis is 4. V. Mitosis is haploid, meiosis is diploid. A. I, II, and III B. I, III, IV and V C. I, Il and IV D. I. II. II. V IV, • If you were asked to cormplete the table with the correct answer, which of the following table would you chose? А. CHITERIA MITOSIS MEIOSIS 1. No. of nuciear dimaion Synapais/cossing ove 3. Centromere of NIuzer chromatids atanaphase No. of daaghter cells PTESEnt MI-anached separates Present separates Haploid 5. No of…