Question

Which of the following are not considered as events prophase-I (1) Formation of dyads of cells (II) Segregation of homologous chromosomes
(III) Process of synapsis
(IV) Terminalisation of chiasmata
(a) I, II (b) I, II, IV (c) III, IV (d) II, III, IV​

Answer 1

Answer:

Option a is not considered as events in prophase-$1$

Explanation:

Meiosis is a type of cell division by halving the chromosome number and results in the haploid sets of chromosomes that occur in sexual reproduction. It happens twice in a cell as meiosis$1$ and meiosis$2$ . Each meiosis includes further four phases. They are; Prophase, metaphase, anaphase, telophase.

The prophase phase in meiosis$1$ is referred to as prophase-$1$. This phase includes further five stages, which are; Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis. Here in these options, option $3$, process of synapsis, occurs in Zygotene stage and option $4$, terminalisation of chiasmata, occurs in Diakinesis stage. So, options $3,4$  are the events of events of prophase-$1$ while the other two occur in telophase and anaphase, respectively.