1.Why do organisms do Meiosis?
A.To make more skin and muscle cells in their bodies
B.To make gametes (sperm or eggs)
C.Just for fun!
D.All of the above

2.What happens during Metaphase I?
A. Tetrads line up down the middle of the cell.
B. Chromatin condenses to form visible chromosomes.
C. Homologous chromosomes separate and move toward opposite ends of the
cell.
D. All of the above

3. Which of the following are true?
A. Cytokinesis is the division of the cytoplasm to form two separate cells.
B. Cytokinesis may occur at the same time as Telophase I.
C. The two new cells produced at the end of Telophase I and Cytokinesis are
hapoid.
D. All of the above

4.How is prophase II different than prophase I?
A. Tetrads do NOT form in prophase II.
B. The nucleus does NOT go away during prophase II.
C. There are NO hromosomes during prophase II.
D. All of the above

5. What happens during Telophase II?
A. Each newly forming cell gets a nucleus
B. Chromosomes uncoil to form chromatin.
C. 4 haploid gametes are being formed.
D. All of the above.

6. What are the final results after telophase II and cytokinesis are finished?
A. 4 diploid gametes
B. 2 diploid gametes
C. 4 haploid gametes
D. 2 haploid gametes

7. Which of the following are true statements?
A. DNA replicates during interphase.
B. Chromatin is made of DNA.
C. Genes are found on DNA.
D. All of the above

Respuesta :

1. B

2. A

3. A.

4. D

5.

Through meiosis, an original diploid cell -germ cell- suffers reductive and non-reductive divisions, and turns into four haploid cells -gametes-.

1) B. / 2) A. / 3) A. C. / 4) A. / 5) A. B. / 6) C. / 7) D.

   

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Let us first review some framework about meiosis.

Through Meiosis, a diploid cell (2n) produces four haploid daughter cells (n).

Thes haploid cells are the gametes or sex cells.

After DNA replication there are two meiotic phases.  

The first one is a reductive phase, in which homologous chromosomes separate.  

In the second phase, the cell suffers a new, not reductive division.  

1. In the first phase, Meiosis I:

  • Prophase I: Chromosomes condensate and become visible. Occurs crossing-over between homologous chromosomes. Crossing-over makes the daughter cells to be genetically different from the original one.  

  • Metaphase I: Homologous chromosomes randomly align in the equatorial plane.  

  • Anaphase I: In this phase occurs the division and independent separation of homologous pairs. Each chromosome migrates to different poles. This separation generates different chromosomal combinations in the daughter cells.  

  • Telophase I: Chromosomes of homologous pairs are already in the corresponding poles, and the nuclear membrane forms again in each pole.  

  • Cytokinesis occurs. Two cells are formed

2. In the second phase, Meiosis II:  

  • Prophase II: Chromosomes condensate again and become visible.  

  • Metaphase II: Chromosomes join the spindle apparatus and migrate to the equatorial plane, where they randomly line up. Sister chromatids are holden together until they reach the Anaphase.  

  • Anaphase II: Centromeres divide, chromatids get separated, and each of them goes forward an opposite cellular pole.  

  • Telophase II: Once in the poles, the chromosomes become lax again, and the nuclear membrane forms again.  

  • Cytokinesis occurs. Four cells are formed

1) B. To make gametes (sperm or eggs)

2) A. Tetrads line up down the middle of the cell.

3) A. Cytokinesis is the division of the cytoplasm to form two separate    

        cells.

   C. The two new cells produced at the end of Telophase I and    

        Cytokinesis are  hapoid.

4) A. Tetrads do NOT form in prophase II.

5) A. Each newly forming cell gets a nucleus

   B. Chromosomes uncoil to form chromatin.

6) C. 4 haploid gametes

7) D. All of the above

   

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