4. Nondisjunction occurs during meiosis in a marabara with the following genotype: purply, /pur*.a.Assume nondisjunction occurs during Meiosis I, diagram out meiosis in the cells at the stages shownbelow for this situation. Be sure to correctly show and label chromosomes vs chromatids, theirgenotypes, centromeres, the synaptonemal complex, and spindle at metaphase.жProphase IMetaphase IAnaphase ITelophase IMetaphase IIAnaphase IITelophase II

Diagram: Key Labels:Chromosome: A single unit of DNA and protein.Chromatid: One of the two…

Answered: 4. Nondisjunction occurs during meiosis…

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...

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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?
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.
You are to compare mitosis with meiosis I and II for a diploid cell that is 2N = 46 chromosomes. (2N = 46)e] Mitosis Meiosis I and II How times are the chromosomes a. b. duplicated/replicated? d. at the end of meiosis Number of daughter cells at the end of division C. f. meiosis I and II How many times does the cell divide? Choice: 0, 1 or 2? е. How many chromosomes are in h. end of meiosis I and II each daughter cell at the end of division if 2n = 46? g. How the chromosomes lined up during metaphase (not the j. meiosis I only i. middle)? L. meiosis I only What separates during Anaphase? k. When does crossing over occur? m. n. When does independent O. assortment occur? p.
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.
A.If the diploid human chromosome number (2n) =46, what will be the chromosome number per cell in each stage of meiosis if nondisjunction of a pair of chromosomes happened during anaphase I of Meiosis I.
Please help
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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).
Arial 11 BIUA 田回▼ 三=三|三|: 12 II 4. Below is a diploid cell in meiosis. a. Label one set of homologous chromosomes, one set of sister chromatids and one set of heterologous chromosomes. b. How many alleles of the 'A' alleles are present in the cell at Prophase 1? c. How many copies of the 'A' genes are present in each cell at Prophase II? d. How many 'a' alleles are present in Anaphase 1? e. How many 'F' alleles are present in each cell in Metaphase I? f. How many 'f alleles are present in each cell in Metaphase ll? g. How many 'F' genes are present in each gamete? h. How many chromosomes will be present in each gamete? MacBook Air
Genetic problems: Use the diagram below to figure out how each monosomy or trisomy can a) Normal X chromosome segregation b) Nondisjunction in meiosis I c) Nondisjunction in meiosis II Diploid cell at start of meiosis First meiotic division Nondisjunction Second meiotic division Nondisjunction 00 00 develop. Benjamim XCuinmi х Х х х Xх хх о о XX O 2. A color-blind man married a normal woman. Their daughter, who was phenotypically normal, married a normal man and the couple produced three children, a normal boy, a color-blind boy, and a color-blind girl. Further examination indicates that this girl has two X chromosomes. Explain the origin of the color- blind girl.
6) The plant Haplepoppus gracilis is diploid (2n = 4). Inside each cell (represented here by the oval) there are four total chromosomes: one long pair (represented by "A" and "a") and one short pair (represented by "B" and “b"). The following diagrams represent possible anaphases of this cell during meiosis or mitosis. The lines represent chromosomes/chromatids being pulled to either the north or south pole of the cell, and the vertex of each "V" represent the centromere which would be attached to kinetochore microtubules. For representative cells 1– 12, say if the diagram represents a cell in anaphase I of meiosis I, anaphase II of meiosis II, anaphase of mitosis, or shows an impossible situation. If the situation is impossible, explain why. い。 VA Vb VA VB VV. V b Va VB VAVA Vo VB ^^ ^ が VaVA Vo VB くs

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