Stages of the Cell Cycle

Job

G1 (Interphase)

Making copies of chromosomes

S (Interphase)

Centrosomes separate

G2 (Interphase)

Chromatin becomes condensed & coiled

Prophase

Can now see duplicated chromosomes under scope

Prophase

Nucleolus disappears

Prophase

NM begins to disintegrate

Prophase

Centrioles begin to move

Prophase

SF begins to form

Prophase

Fragmentation of the NM

Prometaphase

Microtubules pierce through the NM

Prometaphase

Centrosomes/centrioles almost at opposite ends

Prometaphase

Chromatids make a kinetochore

Prometaphase

“Jerky Mvt” are seen

Prometaphase

Some SF attach to kinetochore

Prometaphase

Centrosomes/centrioles are at opposite ends

Metaphase

Chromosomes are at the equator

Metaphase

Spindle is seen

Metaphase

All SF are attached to a centromere at the kinetochore

Metaphase

Metaphase plate = equator

Metaphase

All non-kinetochore SF overlap

Metaphase

Sisters separate & move to opposite poles following the disintegrating SF

Anaphase

Non-kinetochore SF lengthen

Anaphase

By end, chromosomes are at opposite poles

Anaphase

Shortest

Anaphase

NM begins to reform

Telophase

Chromatin become less coiled

Telophase

Cytokinesis occurs via microfilaments

Telophase

Number of chromatids/chromosomes during G1

0 Chromatids, 46 Chromosomes (diploid)

Number of chromatids/chromosomes during S

92 Chromatids, 46 Chromosomes

Number of chromatids/chromosomes during G2

92 Chromatids, 46 Chromosomes

Number of chromatids/chromosomes during Prophase

92 Chromatids, 46 Chromosomes

Number of chromatids/chromosomes during Prometaphase

92 Chromatids, 46 Chromosomes

Number of chromatids/chromosomes during Metaphase

92 Chromatids, 46 Chromosomes

Number of chromatids/chromosomes during Telophase

0 Chromatids, 92 Chromosomes

Number of chromatids/chromosomes after Cytokinesis

0 Chromatids, 46 Chromosomes (X2)