Cell division is a part of a long series of events called the cell cycle. The cell cycle consists of two main phases — interphase and the division phase. There are two types of cell divisions which occur in our body for growth, repair replacement and gamete formation. Mitosis and meiosis mainly differ from each other with respect to the number of daughter cells produced, the number of chromosomes in the daughter cells and the purpose of division, etc.

(i) Both kinds of cell divisions start after the completion of interphase which includes G-1 phase, S-phase and G-2 phase. Interphase is the preparatory phase. Choose the correct statement from the options given below :

1. Mitosis occurs in each and every cell of the human body.
2. Chromatids split into two homologous chromosomes during prophase.
3. Chromatin fibres become distinct and develop into chromosomes during prophase.
4. RNA and histamines are the components of chromatin.

(ii) Interphase is the longest part of the cell cycle which lies between two successive cell divisions. Choose the incorrect statement from the options given below:

1. Interphase is followed by karyokinesis and then cytokinesis at last.
2. Synthesis of RNAs and proteins occurs actively in the first growth phase (G-1 phase).
3. Interphase also occurs between equational and reductional division phases of meiosis.
4. Replication or duplication of DNA occurs in the synthesis phase (S-phase).

(iii) Daughter cells formed from one parent cell after the two phases of meiosis (equational and reductional) are:

1. Identical and diploid
2. Four daughter cells are produced with haploid chromosome number.
3. Two daughter cells are produced with diploid chromosome number.
4. Both (a) and (c)

(i) Chromatin fibres become distinct and develop into chromosomes during prophase.

Reason — During prophase, chromatin fibres condense and organize into chromosomes.

(ii) Interphase also occurs between equational and reductional division phases of meiosis.

Reason — There is no interphase between the reductional and equational phases of meiosis, but there is a short stage called interkinesis.

(iii) Four daughter cells are produced with haploid chromosome number.

Reason — In meiosis, two successive divisions occur. In the first division, called reductional division, the chromosome number is reduced to half. In the second division, called equational division, the chromosome number remains the same. Therefore, four haploid daughter cells are produced.