Mitosis
Why do cells divide
Growth, Repair, Reproduction, To maintain a ratio
What are the 2 types of cells in the human body
Sex cells (reproduction cells - undergo reproduction through mitosis)
Somatic cells (all other types of cells - undergo reproduction through mitosis)
What needs to duplicate before cell division
The chromosomes
What are the stages IN ORDER in the cell cycle
Interphase, Prophase, Metaphase, Anaphase, Telophase and Cytokenisis
What stages are part of mitosis in the cell cycle?
Prophase, Metaphase, Anaphase and Telophase
What is a chromosome
Condensed chromatin, made up of 2 sister chromatids attatched to each other at the centromere
What is Chromatin
Long thin strands of DNA and protien, condeses into chromosomes during mitotic division
What are Chromatids?
Each arm of the chromosome
What is the centromere
The point at which the chromatids are attatched to each other
Interphase
Invisible/faint under microscope, period of rest, chromosomes duplicate into 2 sister chromatids, (2 attatched sister chromatids are considered 1 chromosome)
Prophase
Chromosomes shorten and thicken, centrioles separate and move to opposite poles of the cell, nuclear membrane dissolves
Metaphase
Sister chromatids line up at the equatorial plate, spindle fibres attatch to the chromosomes
Anaphase
Centromeres divide and the resulting chromosomes move to opposite poles of the cell
Telophase
Spindle fibres dissolve and the nuclear membrane reappears, chromatin becomes thinner and lengthens
Cytokinesis
Cytoplasm divides (telophase and this usually occur at the same time)