What are: chromatin, sister chromatids, centromeres, centrosomes, centrioles, mitotic spindle? Name any “phase” of mitosis and...

What are: chromatin, sister chromatids, centromeres, centrosomes, centrioles, mitotic spindle? Name any “phase” of mitosis and describe what is happening (Do this for all phases).
What happens at G₂ of Interphase in preparation for mitosis? G1? S?
At what stage of mitosis do the chromosomes line up in the middle of the cell? What is happening at this stage in mitosis?
What are the purposes of mitosis?
Describe cytokinesis and Plant and Animal cells

Expert Solution

Chromatid :- Chromatid is one of two identical halves of replicated chromosome.

Sister chromatid :- Jointed chromatids of a chromosome is known as sister chromatid.

Centromere :- it links the pair of sister chromatid have specialised DNA sequence.

centrosome :- is an organelle contain two centrioles which help in cell division only present in animal cell .

centriole :- cylindrical organelle consist of tubulin protein.

mitotic spindle:- centriole give rise to spindle fibres they help in cell division.

Metaphase :- in this phase centrosomes divided into two centrioles .centrioles move towards the poles of a cell give rise to spindle fibres .Spindle fibre is attached to the centromere of a chromosome .All chromosomes are arranged at metaphasic plate.

G2 phase :- Protein synthesis , ATP synthesis ,cell growth

G1 phase :- Protein synthesis ,ATP synthesis , cell growth , synthesis of various enzyme and nutrients

S phase :- DNA replication occur but,number of chromosomes remain same

In metaphase all chromosomes are lined in metaphasic plate with the help of spindle fibres .In late metaphase chromosomes are divided into chromatid and each chromatid will carry a centromere with the help of centromere spindle fibres are attached to the chromosome.Spindle fibres stretch and chromatid move towards the poles.

Purpose of mitosis:- parent cell divided into two equal daughter cells .So,genetic material of parent cell and daughter cells remain same,daughter cells are resembles to each other .Daughter cells are similar to parent cell.

cytokinesis :- the process of cytoplasmic division.

In plant cell cytokinesis occur by cell plate method.

In animal cell cytokinesis occur by cell clevage method.

gladiator answered 1 year ago

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In mitosis, cohesin dissolves during _________, allowing sister chromatids to separate. a. Prometaphase b. Metaphase c....

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chemotherapy drugs such as vincritsine disrupt mitosis. exactly what mitotic structure do this drug target and...

chemotherapy drugs such as vincritsine disrupt mitosis. exactly what mitotic structure do this drug target and what effect would that have on cell division?

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