c12

cell cycle

division of one cell reproduces a whole organims in

unicellular organisms

multicellular eukaryotes dpeend on cell division for

development from a fertilized egg, growth, repair

cell cycle

the life a cell from formation to its own division

genome

all dna in a cell

dna molecues in a cell are packaged into

chromosomes

what do eukaryotic chromosomes consist of

chromatin a complex of dna and protein that condenses during cell division

what type of cell has two sets of chromosomes vs half as many

somatic(nonreproductive) and gametes(sprem and egg)

what happens before cell division

dna is replicated and the chromosomes condense

cleavage furrow

dip right before cystokinesis(nuclear envelope and nucleolus begins to fowm during telophase)

mitotic spindle

made of microtubules that controls chromosome movement

when does centrosome replicate?

interphase forming two centrosomes that migrate to opposite ends of the cell during prophase and prometaphase

two types of regulatory proteins involved in cell cycle control

cylins and cyclin dependent kinases(cdks)activity of cdks rise and fall with changes in concentration of cyclin

MPF

is a cyclin cdk complex that triggers a cells passage past the g2 checkpoint into the m phase

g1 checkpoints

its the most important and if it isnt approved it goes to g0 no divisioj

external factors

growth facotrs(released by certain cells and stimulate cells to divide) PDGF is made by platlets(white blood cells)

anchorage dependence

celles require

density dependent inhibition

cells form a single layer

density dependent inhibition

cells divide to fill a gap and then stop