What are the possible abnormal gametes the male can produce with non-disjunction occuring in Meiosis I? Identify the possible sexual aneuploidy syndrome if these abnormal sperm cells are fertilized by a normal egg cell. Could this man father a Tuner syndrome (XO) child? Could this man father a Klinefelter's syndrome child (XXY)?
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- Fill in the cells below showing the process of meiosis of the male's sex chromosomes with non- disjunction occuring during meiosis II. DO NOT show crossing over. Prior to meiosis 44 +XY What are the possible abnormal gametes the male can produce with non-disjunction occurring in Meiosis II? Identify the possible sexual aneuploidy syndrome if these abnormal sperm cells are fertilized by a normal egg cell. Could this man father a Tuner syndrome (XO) child? Could this man father a Klinefelter's syndrome child (XXY)?Fill in the cells below showing the NORMAL process of meiosis of the male's sex chromosomes (XY – the X and Y are representing the entire chromosome, and remember X and Y act like a homologous pair). DO NOT show crossing over. prior to meiosis 44 +XY What are the possible normal gametes produce after meiosis division? Identify the possible sex of the offspring if these normal sperm cells are fertilized by the egg cell.A primary spermatocyte has the genotype DdEe. These genes assort independently at Meiosis I. Show the chromosomes containing these genes at Metaphase I, Telophase I and Telophase II using diagrams. Diagrams must be clearly labelled and show metacentric chromosomes undergoing meiosis.
- Identify the stages of meiosis described by the following meiotic events/conditions/terms. Write prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, or telophase II. In case the events are found in both stages, write the stages both. 1. Separation of homologous chromosome 2. Four haploid daughter cells are formed.Identify the stages of meiosis described by the following meiotic events/conditions/terms. Write prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, or telophase II. In case the events are found in both stages, write the stages both. 1. Formation of chiasma 2. Each chromatid is considered as full-fledged chromosome. 3. Chromosomes begin to pair off. 4. Spindle microtubules start to attach to the centromere. 5. Tetrads are aligned at the middle of the cell. 6. The sister chromatids separate. 7. Produce 2 haploid daughter cells. 8. The chromosomes line up at the middle of the cell. 9. The sister chromatids move together to the opposite poles. 10. The chromatids reach the poles. 11. The chromosomes in each daughter cell are still duplicated.12. Spindle microtubules attach in the centromere of each haploid daughter cell. 13.Formation of Gametes The following cell completed interphase and replicated the chromosomes for meiosis. During the formation of gametes, the chromosomes failed to separate properly during meiosis. Complete the table below by indicating the two possible stages in meiosis where nondisjunction could occur and the possible combination of gametes. A) Type of Nondisjunction (Identify the meiotic stage.): _______________________ Daughter Cell 1 Daughter Cell 2 Daughter Cell 3 Daughter Cell 4 Number of Chromosomes in Each Daughter Cell B) Type of Nondisjunction (Identify the meiotic stage.): _______________________ Daughter Cell 1 Daughter Cell 2 Daughter Cell 3 Daughter Cell 4 Number of Chromosomes in Each Daughter Cell
- A primary spermatocyte has the genotype AaBbee. The A and B loci are linked in cis configuration on the long arm of an acrocentric chromosome. The E locus is on a metacentric chromosome. Show the chromosomes containing these genes at Metaphase I, Telophase I and Telophase II using diagrams. Diagrams must be clearly labelledIV. Observation: No Crossing Over Crossing Over Appearance of Gamete Cells Appearance of Gamete Cells V. Analysis: 1. If the two sister chromatids are the same, how are they called? 2. Which specific parts exchanged genetic information during cross over? 3. What is crossing over? 4. When will crossing over occurs? Why? 5. What will happen after crossing over? 6. How do meiosis contributes to genetic variation, while mitosis does not? 7. Why is crossing over important for evolution of species?The cells seen below were stained with Acetocarmine. Scales indicate 20 micrometers. Please explain what stages of meiosis are visible in cells labelled A through F. Give reasons for each stage of meiosis you consider the cell to be in. A В C D E F
- What are the possible abnormal gametes the male can produce with non-disjunction occurring in Meiosis II? Identify the possible sexual aneuploidy syndrome if these abnormal sperm cells are fertilized by a normal egg cell. Could this man father a Tuner syndrome (XO) child? Could this man father a Klinefelter's syndrome child (XXY)?Picture name - Tradescantia spathacea meiotic cell. HPO (400x)Shown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrographs: Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge). Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph). Explain how these aberrations are formed and relate to the possible causal mutation(s). Will this result to sterile and/or fertile gametes? Explain.3) For each cell below, identify the meiosis phase (meiosis I or II) and stage of meiosis it is in (or if it is in interphase).