Question

Use the following key to answer the following questions. Each answer may be used once, more than once, or not at all.

            A.  The statement is true for mitosis only.

            B.  The statement is true for meiosis I only.

            C.  The statement is true for meiosis II only.

            D.  The statement is true for mitosis and meiosis I.

            E.  The statement is true for mitosis and meiosis II.

46.__  Sporophytic plant cells produce the 4 haploid spore cells.

47.__  Dyads are aligned on the equatorial plate of cell.

48.__  Cell division occurs and the cells produced have the haploid number of chromosomes.

63.  Please draw DNA in the cells in the following stages of mitosis or meiosis for an organism with a diploid number of 6. On at least once include the centrosomes, spindle fibers, poles, kinetochores, centromeres, and monad/dyad labels.

A. Metaphase mitosis

B. Metaphase I meiosis

C. Anaphase II meiosis

64. Fully outline and explain the concept of alteration of generations.   Contrast this with the mechanisms/patterns associated with your life cycle.  Clearly show transition events and describe each. Make an illustration and carefully label all components.

Answer 1

46. C. The statement is true for meiosis II only. Four haploid cells are formed from a single diploid cell during meiosis which has two parts: meiosis i and meiosis ii. Since 4 haploids are forming in the second part only, most appropriate answer will be meiosis ii. However bother meiosis i and ii together result in formation of 4 haploid cells from a diploid cell.

47. E. The statement is true for mitosis and meiosis II. It occurs during metaphase of mitosis and meiosis II. During meiosis I, tetrad is involved rather than dyad.

48. E. The statement is true for mitosis and meiosis II. Mitosis can result in formation of two haploid cells from one haploid cell, or two diploid cells from one diploid cell. Meiosis II results in formation of four haploid cells from two diploid cells.