lecture 10 - mitosis

cell division is the process of

pre-existing cells dividing

cell division purpose

organism growth, reproduction, dmg tissue repair

mitosis is

is nuclear division

cytokinesis is

is the division of the cytoplasm into 2 daughter cells

each chromosome contains a

a single, linear, double stranded DNA molecule

Ploidy is

is the number of complete sets of chromosomes

one copy of each chromosome →

→ haploid or n

two copies of each chromosome →

→ diploid or 2n

Interphase - G1

cells carry out normal functions & sometimes grows (DNA not duplicated)

Interphase - S

DNA replication produces 2 sister chromatids for each parent chromosome

Interphase - G2

cell growth continues to prepare for mitosis & cytokinesis

prophase - nucleus

breaks apart

prophase - chromosomes condense

prophase - chromosomes condense

prophase - mitotic spindle begins to form

prophase - mitotic spindle begins to form

metaphase: chromosomes line up at the —

— metaphase plate in the middle of the cell

anaphase - the spindle pulls the

sister chromatids to opposite spindle poles

telophase

• spindle disassembles

• chromosomes decondense

• nuclear division is complete

cytokinesis

• division of the cytoplasm

• cleavage furrow forms until it cuts the cytoplasm into two parts

• cell plate in in plants

mitosis

• growth of multicellular organism

• single cell organism mechanism of asexual reproduction

• amoeba divides by mitosis

cancer occurs

cancer cell divide

when cells lose normal control

continuously and uncontrollably (tumor)