Each chromosome conists of only one centromere but during certain times in the c

Question

Each chromosome conists of only one centromere but during certain times in the cell cycle could consist of two DNA molecules (sister chromatids). If a cell in G1 of interphase has 16 chromosomes answer the following questions

In G2 of interphase how many chromosomes will be found per A 16 Cell? B. 16 In G2 of phase how many DNA molecules will be found per c. cell? D. 16 In teleophase l of meiosis how many chromosomes will be found E. 16 per cell? In meiosis how many DNA molecules will be foun 32 teleophase l of er cell? After cytokinesis of mitosis how many chromosomes will be found per cell? After cytokinesis of mitosis how many DNA molecules will be found per cell?

Explanation / Answer

1.In G2 of interphase :Number of chromosomes found per cell will be :E. 16.

Reason: Number of chromosomes is the same as two sister chromatids are attached to a single centromere.

2.In G2 of interphase:Number of DNA molecules found per cell will be:F.32

Reason: Chromosomes split into sister chromatids.16 chromosomes =32 chromatids = the number of DNA molecules.

3.In telophase of meiosis I: Number of chromosomes found per cell will be: C.8

Reason: Cells divide to form 2 cells and so chromosomes become half i.e 16/2 =8

4.In telophase of meiosis I:Number of DNA molecules found per cell will be :D. 16

Reason:Chromosomes are in form of chromatids.So 8*2 =16 chromatids = 16 DNA molecules.

5.After cytokinesis of mitosis, number of chromosomes per cell will be :A. 16

Reason:Each cell will receive same number of chromosomes as that in the start of mitosis.

6.After cytokinesis number of DNA molecules per cell will be : B.16

Reason: After cytokinesis cells will enter into G1 phase of interphase.

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