6. When a cell begins to prepare for cell division, DNA synthesis occurs in a) G
ID: 196939 • Letter: 6
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6. When a cell begins to prepare for cell division, DNA synthesis occurs in a) G1 phase b) S phase c) G2 phase d) GO phase 7. A cross involving only a single genetic trait is called a. monohybrid cross b. test cross c. back cross 8. A typical phenotypic ratio for a monohybrid cross is b) 3:1 c) 3:3:1 9. The cytoplasmic division in plants must be facilitated by a mechanism called a) cleavage furrow formation spindle equator formation spindle plate formation b) c) d) cell plate formation e) a& d 10. Which of the following is a phase of mitosis? a. cytokinesis b. interphase c. prophase d. S phase 11. One difference between cell division in plant cells and in animal cells is that plant cells have a. centrioles. b. centromeres. c. a cell plate. d. chromatin. 12. During normal mitotic cell division, a parent cell having four chromosomes will produce two daughter cells, each containing a. two chromosomes. b. four chromosomes c. eight chromosomes. d. sixteen chromosomes. 13. If a cell is in G2 it has twice the amount of DNA present in a telophase nucleus a) b) it has visibly distinct chromosomes. c) it lacks a visible nuclear membrane. d) it is in mitosis. e) it is in cytokinesisExplanation / Answer
1. When the cell begins to prepare for the cell division there are many stages. There are two main phases in the cell cycle- Interphase and M-phase. Interphase is further divided into G1, S, G2. In the G1-(gap phase 1)-phase growth of the cell occurs. During S-phase DNA replication is carried out and in the G2 phase the cell goes to the final stages of growth before intering to the M-phase.
Hence, the right answer is option (B)- S-phase
2. Monohybrid cross-A cross between two individuals that involve pair of single trait (TT x tt), Here T and t are two alleles which are responsible for the single trait eg. Tallness.
Hence, the right answer is option (A)- Monohybrid cross
3. The cross between two individuals that involve pair of single trait (TT x tt)
The cross between TT x tt gives Tt, Tt, Tt and Tt (the phenotypic and genotypic ratio is 1:1) in F1 generation whereas the cross between F1 individuals Tt x Tt gives TT, Tt, Tt and tt (the phenotypic ratio is 3:1 and the genotypic ration is 1:2:1) in the F2 generation.
Hence, the right answer is option (B)- 3:1
4. Cytoplasmic division or cytokinesis is carried out for the equal distribution of the cellular components and cell organelles into the two separated cells. In the plant cell this is carried out by the cell plate formation.
Hence, the right answer is option (D)- cell plate formation
5. There are two main phases in the cell cycle- Interphase and M-phase
Interphase is further divided into G1, S, G2. In the G1-(gap phase 1)-phase growth of the cell occurs. During S-phase DNA replication is carried out and in the G2 phase the cell goes to the final stages of growth before intering to the M-phase.
M-phase is divided into the following- Prophase, Metaphase, Anaphase and Telophase. Cytokinesis is the part of telophase. In which the actual cell division occurs.
Hence, the answer is the option C-prophase
6. The final cell division in plant cell is carried out in the cytokinesis phase (part of telophase) by the the cell plate formation whereas in the animal cell the division of the cell is carried out by the cleavage furrow formation.
Hence, the answer is the option C- A cell plate
7. During normal mitotic cell division, a parent cell having 4 chromosomes will produce two daughter cell and the each daughter cell contains 4 chromosomes because of the DNA replication which occurs in the S-phase of the interphase.
Hence, the answer is the option B- 4 chromosomes
8. If the cell is in the G2 phase it must cnatins twice the amount of DNA present in a telophase nucleus because DNA replication occurs in the S-phase before G2 phase.
Hence, the answer is the option A- it has twice the amount of DNA present in a telophase nucleus
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