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Phases of Mitosis and Meiosis
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Phases of Mitosis and Meiosis
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Phases of Mitosis and MeiosisInterphase (mitosis) - correct answer-after chromosome replication, each chromosome is
composed of two sister chromatids. Centrosomes have replicated.
Prophase (mitosis) - correct answer-chromosomes condense, and spindle apparatus begins
to form
prometaphase - correct answer-nuclear envelope breaks down, and kinetochore
microtubules contact chromosomes at kinetochore
metaphase (mitosis) - correct answer-chromosomes complete migration to middle of cell
anaphase - correct answer-sister chromatids separate, and chromosomes are pulled to
opposite poles of the cell
telophase - correct answer-the nuclear envelope re-forms, and the spindle apparatus
disintegrates
Cytokinesis - correct answer-actinmyosin ring causes the plamsa membrane to begin
pinching in and two daughter cells form
G1 checkpoint - correct answer-in order to pass:
-cell size must be adequate
-nutrients must be sufficient
-social signals are present
-DNA is undamaged
G2 checkpoint - correct answer-in order to pass:
-chromosomes have replicated successfully
-DNA is undamaged
-activated MPF (mitosis-promoting factor) is present
S phase - correct answer-DNA synthesis
Prophase I (meiosis) - correct answer--chromosomes condense, and nuclear envelope
breaks up, spindle apparatus forms. Synapsis of homologous chromosomes
-crossing over of non-sister chromatids
Metaphase I (meiosis) - correct answer-tetrads migrate to metaphase plate
Anaphase I (meiosis) - correct answer-homologous chromosomes split and migrate to
opposite sides of the cell
Telophase I/cytokinesis - correct answer-chromosomes move to opposite sides of cell, then
cell divides
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