Mitosis & Chromosomes Histology SSN September 22, 2004 Presented By: Tresha Edwards & Nadia Goodwin.

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Presentation transcript:

Mitosis & Chromosomes Histology SSN September 22, 2004 Presented By: Tresha Edwards & Nadia Goodwin

The Cell Cycle What is the ploidy of the cell at stage G2? Cell during Interphase

STAGES OF MITOSIS Whitefish Mitosis Key Structures: Nuclear Membrane, Chromosomes, Spindles, Cytoplasmic membrane I PM A T

Prophase Assembly of mitotic spindle Chromosome condensation

Prophase

Prometaphase Nuclear envelope breakdown Attachment of chromosomes to spindle apparatus

Metaphase Alignment of the chromosomes at the metaphase plate Rate-limiting step of mitosis! Metaphase plate Kinetochore microtubules Spindle poles

Anaphase Anaphase A Sister chromatids separate and move towards poles Kinetochore microtubules shorten Anaphase B Spindle poles move apart Cytokinesis begins

Telophase Nuclear envelope reassembly Chromosome decondensation Cytokinesis is completed

Question 1 Put the numbered cells in sequential order

Question 2 This structure could be part of the a)Kinetochore b)Centromere c)Microtubule Organizing Center (MTOC) d)Cleavage furrow e)Chromatid

Question 3 What characteristics would you expect to find in the cell at the pointer: I. Spindle apparatus II. Nuclear envelope III. Contractile ring IV. Equatorial plate a)I and II only b)I, II, and IV c)I and IV d)All

Question 4 1 All of the following pertain to the cell labeled 1, EXCEPT: a)Nuclear envelope has disbursed b)Mitotic spindle has begun formation c)Centrosomes have separated d)DNA has been duplicated