Question

What is meiosis 1st and 2nd.??.?.?

Answer 1

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$\textbf{Here is yur ans...}$

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♦ $\huge{Meiosis\:1st..}$

> Heterotypic division or reduction division. It leads to reduction in chromosome number. Division of chromosome does not occur in meiosis -1 and inly segregation of Homologous chromosomes( Bivalent) takes place.

> Meiosis 1 is initiated after the parental chromosomes have replicated to produce identical sister chromosome at the S-phase.

> Meiosis 1 involves pairing of Homologous chromosomes and recombination between them.

♦ $\huge{Meiosis\:2nd.}$

> This is a Homotypic division or equational division. It does not lead to any change in chromosome number.

> Meiosis 2nd us just like mitosis. Division of Centrosome occurs during Meiosis 2nd.

> Four haploid cells arw formed at the end of meiosis 2nd. All the four daughter cells produced by meiosis aregenetically different from each other and also differ from mother cell.

> In meiosis, division of nucleus takes place twice but division of chromosome occurs only once.

$\textbf{Hope it helps u}$✌

Answer 2

$\huge{Meiosis\:1\::}$



* In this Homologous chromosomes are present starting.


* It is a Heterotypic division.


* Phases involved in it are :-

Prophase 1, Metaphase 1, Anaphase 1 and Telophase 1.


* In this individual chromosomes are present in daughter nuclei.


* In this crossing over occurs.

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$\huge{Meiosis\:2\::}$


* Individual chromosomes are present at staring.


* It is a Homotypic division.


* Phases involved in it are :-

Prophase 2, Metaphase 2, Anaphase 2 and Telophase 2.


* Sister chromosomes are present in daughter nuclei.


* No crossing over occurs in it.

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