Q. 23.7( 3 Votes )

Prepare models of various stages of karyokinesis using woollen threads of different colour, beads etc.

Answer :

KARYOKINESIS:

The division of nucleus is called Karyokinesis.


It has four stages – Prophase, Metaphase, Anaphase and Telophase.



It is the longest phase. Here thin, thread, network like chromatin reticulum condenses to form thick, short, coiled chromosomes.


Each chromosome has two chromatids which are held at centromere.


In animal cell centrosome splits into two. The centrioles present in centrosome have already duplicated and they start moving towards the opposite poles.


Each centriole is surrounded by radiating rays called aster.


Between two centrioles a number of fibres called spindle fibres appears.


Nuclear membrane and nucleolus starts disappearing.



The duplicated chromosomes have already reached and arranged on the equatorial plane of the cell.


Each chromosome is attached by spindle fibre with its centromere.



The centromere which is attached to the two chromatids divides and two sister chromatids separate from each other and start moving towards opposite poles.


The movement of chromatids to opposite poles occurs due to contraction of spindle fibres.



Daughter chromosomes reach the opposite poles.


They again become thin, long network like chromatin reticulum.


Nucleolus and nuclear membrane reappears.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Cell Division for NTSECell Division for NTSECell Division for NTSE38 mins
Plant Anatomy and Secondary GrowthPlant Anatomy and Secondary GrowthPlant Anatomy and Secondary Growth49 mins
Growth and Structural HierarchyGrowth and Structural HierarchyGrowth and Structural Hierarchy41 mins
Doubt Session: Cell Structure, Division and OrganellesDoubt Session: Cell Structure, Division and OrganellesDoubt Session: Cell Structure, Division and Organelles49 mins
Quiz on Plant's GrowthQuiz on Plant's GrowthQuiz on Plant's Growth38 mins
Quiz | Cell DivisionQuiz | Cell DivisionQuiz | Cell Division47 mins
Cell Division- MeiosisCell Division- MeiosisCell Division- Meiosis50 mins
Cell Division- MitosisCell Division- MitosisCell Division- Mitosis55 mins
Quiz | Division of PolynomialsQuiz | Division of PolynomialsQuiz | Division of Polynomials38 mins
Genius Quiz |  Division of Algebraic ExpressionsGenius Quiz |  Division of Algebraic ExpressionsGenius Quiz | Division of Algebraic Expressions37 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses