Cell Cycle and Cell Division: Previous Year Qs NEET and AIPMT [ From NCERT ]

 

 

Question:   From NCERT NEET2021  Derived PYQ 

Which of the following stages of meiosis involves division of centromere?

(1) Anaphase II

(2) Telophase II

(3) Metaphase I

(4) Metaphase II

 Answer ▽ 

(1) Anaphase II

 It is during the anaphase, the centromeres divide. The chromatids begin to move towards the two opposite poles.

Meiosis is completed in two separate divisions: Meiosis I and Meiosis II. During meiosis I, there is separation of homologous chromosomes and number of chromosomes in the daughter cell is, thus, reduced to a half. The centromeres split during meiosis II, at anaphase II stage. Thus during meiosis II, number of chromosomes in the daughter cells remain the same as during the start of meiosis II or as at the end of meiosis I which is exactly a half of the chromosome number of original parent mother cell.

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Question:   From NCERT NEET2020  Derived PYQ 

Attachment of spindle fibers to kinetochores of chromosomes becomes evident in :

1. Anaphase

2. Telophase

3. Prophase

4. Metaphase

 Answer ▽ 

4

In prophase, the nucleolus disappears and chromosomes condense and become visible. 

In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores.

In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber.

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Question:   From NCERT NEET  Derived PYQ 

In a mitotic cycle, the correct sequence of phases is

1. S, $G_1$, $G_2$, M

2. $G_1$, S, $G_2$, M

3. M, $G_1$, $G_2$, S

4. $G_1$, $G_2$, S, M

 Answer ▽ 

2

The cell progresses through defined phases of the cell cycle during its division.

first, the G1 in which some organelles starts their duplication then comes S phase where DNA has doubled then G2 phase and finally the M phase. 

So the correct sequence is 'G1,S,G2,M'.

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