cell division🍇 Flashcards
why is mitosis important
tissue repair and replacement, growth, asexual reproduction, development
what happens in g1
cell grows and prepares for dna replication, synthesis of protein for organelle production, replication of organelles
what happens in s
dna is replicated ready for mitosis
what happens in g2
cell finishes growing and prepares for cell division
how is go entered
through g1 phase
what is g0
cell arrest, may be temporary or permanent
g1 checkpoint
checks for nutrient, growth factors and dna damage
what happens if fail g1
enters g0
g2 checkpoint
checks for cell size and dna replication
if pass g2 checkpoint
start mitosis
what happens if fails g2 checkpoint
repair damaged dna to prevent being transmitted to daughter cells
metaphase checkpoint
checks for chromosomes spinal fibres
what happens if fails metaphase checkpoint
arrests cell cycle at m phase until all chromosomes area aligned on spindle
centromere
renters chromatids
are chromatids identical
yes
what are homologous chromosomes
same size, genes at same loci (position)
how do prokaroytics replicate
binary fision
what happens in prophase
chromatin coils and condenses to form chromosomes, nucleolus disappeared and nuclear membrane breaks down, microtubules form spindle fibre shaped structures
what happens in metaphase
chromosomes Allin at equator,spondle fibres attached to centromere