3. Diploid somatic cells of elephants have 56 chromosomes. What would be the resulting number of chromosomes in each one of the four sperms formed from a spermatocyte, if nondisjunction of one chromosome occurs in meiosis I? Briefly justify your answer.
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- 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.Explain how the random alignment of homologous chromosomes during metaphase I contributes to the variation in gametes produced by meiosis.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. 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. How would a tubal ligation or vasectomy influence meiosis in individuals who elected to have one of these operations? 2. Synapsis of homologous chromosomes is perhaps the most important event in meiosis. What is it and what does it do?a. What phase of meiosis is this cell undergoing? b. Identify the 3 things that are incorrect in terms of this cells structure and organization? c. Would this cell produce viable gametes? Why or why not.
- 2.) What are the three function of Meiosis cell division? What is the end result of meiosis cell division?3. A nondisjunction occurs in the sex chromosomes of a male mouse. What ratio of sex chromosome genotypes would you expect among the gametes in the two following scenarios. Make sure to includethe gamete’s sex chromosome genotype in your genotypic ratio. (A) The nondisjunction of the sex chromosomes occurs only in Meiosis I? (B) The nondisjunction of the sex chromosomes occurs only in Meiosis II?7 10 6. Tight pairing of the homologous chromosomes. O Meiosis II O Meiosis I O Mitosis 7. Separation of the two cells into four genetically unique haploid cells. Mitosis O Meiosis I O Meiosis II
- 5. T.) a. Choose the figure (A or B) where nondisjunction occurs in Meiosis I. b. Explain specifically why you chose this figure. (XX) (X) (X) DOO X Meiosis I Meiosis II (4 pts) Pangolins have 19 pairs of chromosomes. hat is the O B (XX) (XX) Meiosis I 28 201 OOOO Meiosis II1.What happens during anaphase in mitosis, meiosis I, and meiosis II? What happens if the steps you just described do not occur correctly during meiosis? State the term for this sort of meiotic error and the term that describes the resulting daughter cells.. If you were asked to complete the table with the correct answer, which of the following table would you chose? А. CHITERIA MITOSIS MEIOSIS 1. Na. of nuciear dimsion 2. Syriapaia/crossing over ECentromere of suster chromatids atanaphase Preseut separates Fresent M-attached/M-separates Haploid S. Na of chromosomes per daughter cell 6 Function Diplaid Growth. Rapair Growth. Repair and Reproduction B. CRITERIA MITOSIS MEIOSIS TNo, af nuclear darinion Synapsin/croing over 3. Centromere af sister chromatids at anaphase Absetit sepiarates Fresent -attached FNo. of daughter cells 5. No. of chromosomes per daughter cell 6 Function Diploid Haploid Growth, Eapair Growth, Repair and Reproduction C. CRITERIA MITOSIS MEIOSIS 1. No. of muclear division 2. Synapsis/crossing over 3. Centromereof sister chromatids at anaphane 4 Na, af daughter cells 5. No. of chromosoetes per daughter cell 6 Punction Absent Present separates MI-attached/Mli-separates Haploid Diploid Gruwth, Repair Reproduction D.…