mitosis/meiosis Flashcards
what happens in interphase- mitosis
G1-protein synthesis
S-DNA replication
G2-organelle divides
-proteins are made
-DNA copied
-cell organelles divide
-ATP produced
-cell gets bigger.
what does chromatin do to genetic material
chromatin stains genetic material.
what happens in mitosis prophase
chromatin condenses t form chromasomes.
-nucleolus disappears.
-nuclear membrane breaks down.
-centrioles move to poles.
what happens in mitosis metaphase
chromosomes line up on equator and become attached to spindle fibres by centromere.
what happens in mitosis anaphase
chromatids move to poles caused by shortening of spindle fibres.
what happens in mitosis telophase-
chromatids reach the poles.
-nucleus and nuclear membrane reforms
-chromosomes unwind.
is mitosis new cell diploid or haploid
diploid-same no of chromosomes as original.
name 3 differences between mitosis and meiosis
mitosis occurs in all organs meiosis occurs in gonads only.
-mitosis produces diploid cells, meiosis creates haploid cells.
-mitosis produces genetically identical daughter cells, meiosis creates 4 genetically non-identical daughter cells.in meiosis there is 2 divisions of chromosomes.
in meiosis chromasomes occurs in pairs what is this called
homologous -one chromasomes from maternal and one from paternal.
what is fertilisation
fusion-re-establishes the diploid no and produces a cell that has homologous pairs of chromosomes.
where does mitosis occur
all organs for gowth and aesexual reproduction
what happens during cytokenesis mitosis
Cytokinesis – during cytokinesis the parent and replicated organelles move to
opposite sides of the cell and the cytoplasm divides thus producing two daughter cells.
what happens during mitosis interphase
Interphase – during this stage the cell grows and then prepares to divide –
chromosomes and some organelles are replicated, chromosomes also begin to condense.
