2. Match the items in Column-I with those in Column-II and choose the correct
Column-I
Column-II
(P) Mitosis
(Q) Meiosis
(i) Occurs in diploid cells only
(ii) Occurs during formation of gametes, and spores
(iii) Daughter and parent cells have same number of
chromosomes
(iv) Crossing over between Homologous chromosomes
Answers
Answer:
Mitosis is a form of eukaryotic cell division that produces two daughter cells with the same genetic component as the parent cell. Chromosomes replicated during the S phase are divided in such a way, that each daughter cell receives a copy of every chromosome.
Meiosis is the form of eukaryotic cell division that produces haploid sex cells or gametes (which contain a single copy of each chromosome) from diploid cells (which contain two copies of each chromosome). In prophase I the homologous chromosomes pair and exchange DNA to form recombinant chromosomes. The prophase I is divided into 5 phases namely:
1. Leptotene: chromosomes start to condense.
2. Zygotene: homologous chromosomes become closely associated (synapsis) to form pairs of chromosomes (bivalents) consisting of four chromatids (tetrads).
3. Pachytene: crossing over between pairs of homologous chromosomes to form chiasmata.
4. Diplotene: homologous chromosomes start to separate but remain attached by chiasmata.
5. Diakinesis: homologous chromosomes continue to separate, and chiasmata move to the ends of the chromosomes
Explanation:
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