Question 43
An organism has two pair of chromosomes (i.e., chromosome number = 4). Diagrammatically represent the chromosomal arrangement during different phases of meiosis-II. Ans. Daughter cell 1 Chromatids Daughter cell 2 — Centriole Prophase-II Spindle fibre Metaphase-II Stages of meiosis II Anaphase-II Telophase-II

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Q. An organism has two pairs of chromosomes (i.e., chromosome number = 4). Diagrammatically represent the chromosomal arrangement during different phases of meiosis-II.

Match the following stages during Mitotic cell division with the key changes:

$\begin{matrix} Column I & Column II i. Prophase & a. Formation of 2 daughter cells, preparation for next division. ii. Metaphase & b. Organelles disappear, formation of chromosomes. iii. Anaphase & c. Spindle fibres, chromosomes at equatorial plate. iv. Telophase & d. Splitting of chromatids, chromosomes move towards poles. v. Interphase & e. Spindle fibres disappear, Cytokinesis follows. \end{matrix}$

Q. Select the incorrect match regarding mitotic cell division.
(i) Prophase - Chromosomes to begin to uncoil
(ii) Metaphase - Chromatids move apart
(iii) Telophase - The nuclear membrane reappears
(iv) Late anaphase- Each chromosome consists of two anaphase chromatids
(v) Interphase - Chromosomes are not distinct

Q. Arrange the following in descending order

a) Number of bivalents formed during meiosis of a spore mother of Ophioglossum.

b) The number of chromatids seen on the equator at metaphase X in pollen mother cell of Haplopappus gracilis during meiosis.

c) The number of chromosomes found at one pole after anaphase II during meiosis in the butterfly.

d) The total number of chromosomes found in all daughter cells formed during meiosis from one megaspore mother cell in Potato.

Q. Assertion: Though the chromosome content of the daughter cells is halved by the end of meiosis I, meiosis II is essential for generation of haploid cells.

Reason: During meiosis II, the duplicated sister chromatids separate from each other and are distributed into the haploid daughter cells.

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