Question

In which sub-stages of meiosis-I do the following events occur?
i) pairing of homologous chromosomes
ii) terminalization
iii) crossing over
iv) formation of spindle apparatus

Answer 1

I) . The pairing of homologous chromosomes also known as Synapsis occurs during prophase I meiosis.

It allows matching up of homologous pair prior to their segregation, and possible chromosomal crossing over between them.

II). Termilizarions occurs in the late prophase of meiosis. It is the process of apparent movement of the Chiasmata to the ends of the chromosomes.

III). The formation of spindle apparatus also known as spindle fibres forms within a dividing eukaryotic cell during the process of both meiosis and mitosis.

It is the spindle that pulls the chromosome from the metaphase to the poles.