1. (a) In diploid organisms, haploid cells or gametes are produced by meiosis. Fig. 2.1 shows diagrams of an animal cell at various points in the first division of meiosis. The diagrams are not in the correct sequence. Fill 1. 4. A (ii) Identify the structures labelled A to D. B 2. с 5. Fig. 2.1 (i) Write the numbers of the diagrams to show the correct meiotic sequence. D B 3. 6. A [1] .[4]

1)Discusses why Meiosis I is referred to as reduction division and why Meiosis II is essentially like Mitosis.  2)Discusses where problems are likely to occur in Meiosis and what these problems could lead to.

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

If a diploid organism has 14 chromosomes (2n=14) a.  How many chromosomes will its gametes have?                                                            b.  After meiosis I during gamete formation, how many chromosomes are in each daughter cell?    c.  After meiosis I during gamete formation, how many chromatids are in each daughter cell?

5.)Gametogenesis, or the formation of gametes, occurs when diploid germ cells undergo meiosis. In fruit flies (Drosophila melanogaster), diploid germ cells contain eight chromosomes. Which of the following correctly describes the number of chromosomes in the daughter cells produced during gametogenesis in fruit flies?     The daughter cells each contain four chromosomes after meiosis I and four chromosomes after meiosis II.   The daughter cells each contain eight chromosomes after meiosis I and eight chromosomes after meiosis II.   The daughter cells each contain eight chromosomes after meiosis I and four chromosomes after meiosis II.   The daughter cells each contain four chromosomes after meiosis I and two chromosomes after meiosis II.

This is a three part question: Mitosis and meiosis are both processes of eukaryotic cell division, with the same names used to describe different stags. a. What are the significant cellular and chromosomal events that occur during each stage of mitosis? b. What are the similarities and differences between the events that occur during each stage of mitosis and the corresponding stage of meiosis I? c. What are the similarities and differences between the events that occur during each stage of mitosis and the corresponding stage of meiosis II?

Shown below is a photomicrograph of Rhoeo tradescantia cell undergoing meiosis. Answer the following question for the photomicrograph: a. Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge) b. Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph) c. Explain how these aberrations are formed d. Will this result to sterile or fertile gametes? Explain.

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,…

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?

Which of the following is a TRUE statement regarding the outcome of meiosis?   A. In meiosis, one diploid cell (2n) can produce 2 haploid cells in males (1n).   B. In meiosis, four haploid cells (1n) can produce 2 diploid cells (2n) in males.   C. In meiosis, one diploid cell (2n) can produce up to 4 haploid cells (1n) in males.   D. In meiosis, one diploid cell (2n) can produce 2 diploid cells (2n) in females.