Stages of Cell Division and Meiosis
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Name the stage of cell division in which paired homologous chromosomes get shortened and thickened?
Ans: Pachytene is the stage of cell division in which paired homologous chromosomes get shortened and thickened.
Which structure of animal cell forms the asters of spindle?
Ans: Centrosome is that structure of animal cell which forms the asters of spindle.
Name the cells in which meiosis occurs?
Ans: Meiosis occurs in the reproductive cells or germ cells.
At which stage of meiosis crossing over of genetic material takes place?
Ans: Pachytene is the stage of meiosis in which crossing over of genetic material takes place.
What is Go phase?
Ans: A stage when cell cycle is arrested during interphase is called Go phase.
Name the cell division concerned with cancer?
Ans: Mitosis is the type of cell division which is concerned with cancer.
What are kinetochores?
Ans: Kinetochores are small disc-shaped structure at the surface of the centromeres.
What is interkinesis?
Ans: Interkinesis is the stage between two meiotic divisions.
Why is mitosis called equational division?
Ans: The chromosome number in the daughter cells is equal to the number of chromosomes in the parent cell hence mitosis is called equational division.
Name the stage of meiosis during which synaptonemal complex is formed.
Ans: Zygotene is the stage of meiosis during which synaptonemal complex is formed.
What is Go phase of cell cycle?
Ans: Go is that phase of a cell cycle where the cells are metabolically active but no longer proliferate.
Where does mitosis take place in plants and animals?
Ans: In plants mitosis takes place in the meristematic tissues whereas, in animals it occurs in the somatic cells.
What is the importance of chromosomes replication during interphase?
Ans: Interphase is a stage between successive cell divisions. It is considered as the resting stage of a nucleus because it does not show any changes in the morphology however, physiologically it is a active stage in the life of a cell as the cell prepares itself for division and other biochemical changes as well.
Distinguish between metaphase of mitosis and metaphase I of meiosis?
Ans: The metaphase of mitosis and metaphase I of meiosis differ from each other as:
| Metaphase of Mitosis | Metaphase of Meiosis: I |
|---|---|
| Each chromosome consists of two chromatids held together by the centromere | Homologous chromosomes form bivalent and each bivalent consists of four chromatids along with two centromeres |
| Chromosomes line up in one plane to make up a equatorial plate | Bivalents become arranged in the plane of equator forming an equatorial plate. |