mitosis Flashcards
what is the series of events in which a cell is formed and divides into daughter cells called
the cell cycle
what are the 3 phases of the cell cycle
interphase - the longest
nuclear division - mitosis
cell divisison- cytokinesis
what is interphase
90% of cell cycle
cell is metabolically active
what is G1
intensive growth and activity
organelles - mitochondira golgi etc are produed
rRNA,mRNA,tRNA IS PRODUCED
What is the point at the end of G1 called
the restriction point
what is the role of tje restriction point
cells that pass are committed to completing the cell cycle many cells do not pass this point and remain in g1
what is S
synthesis
DNA is replicated by the semi-conservative method
chromosomes now consist of two identical molecules called chromatids- joined at the centromere
what is G2
period of cell synthesis -histones synthesised and spindle proteins are produced
DNA checking occurs
What is m phase
mitosis
what is cytokinesis
cell organelles + cytoplasm separated equally and cell divides into 2 daughter cells
description of mass graph
mass doubles (from given units in question) in 12 hours (or given hrs in q)
then mass havles from ‘’’ at ‘’ hrs
explanation of mass graph
from ‘’’ hrs cell undergoes growth,synthesis, DNA replication and nuclear divison
at ‘’ hrs the cell cycle is completed as the cell undergoes cytokinesis , forming 2 new daughter cellls
DNA graph D + E
d = FROM ‘’ HRS dna mass remains constant at ‘’ units
E= the cell is in G1 which is a period of cell growth and cell activity
d= the DNA mass doubles from ‘’-‘’ units in ‘’-‘’ hours
E= DNA is replicated by the semi-conservative method during the S phase, so at the end of the S phase each chromosome is now 2 chromatids
d= from ‘’-‘’ hrs DNA mass remains constant at ‘’ units
e= as the cell completes G2 and mitosis
d= DNA mass havles at ‘’ hrs from ‘’-‘’ units=
e= as the cells complete cytokinesis
what are the four stages of mitosis
prophase
metaphase
anaphase
telophase
what is the process of mitosis
it is a continuous process