2. An organism is 2n=4 with genotype AaBbEe. Genes A and B are close together on the larger chromosome, and gene E is on the smaller chromosome. a. Using a vertical metaphase plate, draw the two independent orientations of this AaBbEe cell in Metaphase I of Meiosis. b. Label alleles on all chromatids. c. Write the alleles in each possible gamete on the lines below each orientation.
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- 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. Given: Adult diploid cell (2n = 8) 2. Show (Illustrate) the condition of the chromosomes during the following events in Meiosis: a. prophase I b. anaphase I c. telophase I d. prophase II e. metaphase II f. anaphase II g. daughter cells at end of telophase II/cytokinesis1. Given: Adult diploid cell (2n = 8) 2. Illustrate the condition of the chromosomes during the following events in Meiosis: a. prophase I b. anaphase I c. telophase I d. prophase II e. metaphase II f. anaphase II g. daughter cells at end of telophase II/cytokinesis
- Homologaus Chromasomes A= В. B = XX C = с. D = Centromere A. Sister Chromatids D. 7. Label the following terms/descriptions as either "Sister Chromatids", "Homologous Chromosomes," or "Both." (1 point each; 9 points total) a. Have identical DNA sequences b. Separate during meiosis c. Separate during mitosis d. Separate during meiosis I e. Separate during meiosis II f. One comes from the mother and the other from the father g. Are held together by cohesion h. Can undergo crossing over i. Are separated by the spindle11. Refer to the figure showing a cell with two pairs of homologous chromosomes in prophase I of meiosis. Genes A (alleles A and a) and D (alleles D and d) are located on the longer pair of chromosomes, and gene B (alleles B and b) is located on the shorter pair. BOOB centromere DoD dood 2 chromatids = chromosome How many different combinations of A, B and D alleles are possible in the genotypes of the daughter cells produced from this cell? O 16 8. O O O Oa. What phase of Meiosis II is the cell in? How do you know? b. Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a gamete from this organism have? c. Draw the same cell during the same phase of Meiosis I. Label the elements.
- A. 1. Division of the cell nucleus, results in two daughter nuclei, each have the same number of chromosomes as the parent nucleus. 2. One two identical halves of a duplicated chromosome. 3. Fusion of haploid (n) gametes; results in the formation of a diploid (2)n zygote. 4. The breaking and rejoining of homologous (non sister) chromatids during early meiotic prophase I, resulting in an exchange of genetic material. 5. The diploid (2n) cell that results from the union of haploid (n) gametes in sexual reproduction. 6. The condition of having one set of chromosomes per nucleus. 7. The complex of DNA, proteins and some RNA that makes up eukaryotic chromosomes. 8. Structures in the cell nucleus, composed of chromatin and containing the genes. 9. An X-shaped site in a tetrad marking the location where homologous chromatids previously underwent crossing over. 10. A sex cell; in plants and animals, an egg or sperm. 11. Type of reproduction in which two gametes (usually, but not necessarily,…One difference between meiosis I and meiosis Il is that Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a chromosomes line up along the equatorial plane only in meiosis I. b cell division occurs only after meiosis II. homologous chromosomes separate in meiosis I; sister chromatids C separate in meiosis II. d chromosomes move toward opposite spindle poles only in meiosis II. DNA synthesis occurs prior to meiosis I; DNA is degraded during e meiosis II.Which of the following statements are True? There may be more than one answer. Select one or more: a. Mitosis results in 2 haploid cells O b. If a parent cell with 10 chromosomes undergoes mitosis, each offspring cell will have 10 chromosomes O c. At the start of meiosis, a human cell will have 46 chromosomes and 92 chromatids d. The purpose of mitosis is the production of gametes e. In Meiosis, crossing over occurs during Meiosis II f. Meiosis only occurs in the testes and ovaries
- 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?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?…Cricotopus sylvestris is a small two-winged fly that is often seen in swarms near water or marshy areas. C. sylvestris is a diploid organism (2n = 4). Make a sketch of: 1. Chromosomes before the S phase on the cell cycle 2. Chromosomes during Metaphase (mitosis). 3. Chromosomes during Anaphase I 4. Chromosomes in a gamete (sperm cell or egg)