1 Determine if the following events occur during Mitosis Mei

1. Determine if the following events occur during Mitosis, Meiosis I, Meiosis II, Mitosis and Meiosis, Mitosis and Meiosis I, or Mitosis and Meiosis II. (Answers may be used once, more than once or not at all. Be as accurate as possible with your answer.)

            ___ 1. The chromosome number is reduced by half.

            ___ 2. The amount of DNA in the cell is twice the amount of a normal diploid cell in G1.

            ___ 3. DNA is replicated during S phase.

            ___ 4. Homologous chromosomes separate.

            ___ 5. Sister chromatids separate.

            ___ 6. Chromosomes condense and align along the metaphase plate.

            ___ 7. Homologous chromosomes align and undergo crossing over.

            ___ 8. Has one round of division per round of DNA replication.

            ___ 9. The number of chromatids is equal to the number of chromosomes of a diploid cell in G1.

            ___ 10. Tetrads align on the metaphase plate.

            a. Mitosis and Meiosis I only

            b. Both Mitosis and Meiosis

            c. Meiosis II only

            d. Mitosis and Meiosis II only

            e. Mitosis only

            f. Meiosis I only

Solution

Growth and reproduction of an individual occurs at cellular level mainly through three phases .The interphase, mitosis, meoisis (has meoisis 1 and 2 ).Interphase can simply describes as phase during which growth of cells occurs and the cell prepares itself for cell division.Occurs before both mitosis and meoisis.Divided into G1,S (Replication of DNA takeplace,twice the amount of DNA than the parent cell),G2 .

Mitosis -stage during which number of cells are increased but chromosome number is retained.Divided into prophase,metaphase,anaphase and telophase.Two identical daughter cells are produced with same number of chromosomes.

Meiosis or reduction division (usually take place during the formation of male and female gamets)have a Meiosis 1 (during which chromosome number is reduced to half e.g.diploid 2n to haploid n) and Meiosis 2 ( similar to mitosis ).Four daughter cells are produced with half the number of chromosome.

Answers.

1 .ans is f ;telophase 1 of meoisis 1

2. Ans a .Mitosis and Meiosis1G2 phase.only in these two phases cells entering division is diploid. In meoisis 2 cells are haploid.

3.Answer is b .S (synthesis phases of both mitosis and Meiosis

4.Answer f Meiosis 1; in mitosis and meoisis 2 chromatids gets segregated.