fig. 8-1, p.124. one chromosome (unduplicated) one chromosome (duplicated) one chromatid its sister...
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one chromosome (unduplicated)
one chromosome (duplicated)
one chromatid
its sister chromatids
Fig. 8-3, p.126
Fig. 8-5, p.128
Interval of cell growth beforeDNA replication (chromosomesunduplicated)
G1
cytoplasmicdivision; eachdaughter cellenters interphase
Interphase ends for parent cell
Interval after DNAreplication; the cellprepares to divide
G2
Interval of cell growth whenthe DNA is replicated (allchromosomes duplicated)
S
mitosis,cytoplasmic
division
One of theunduplicatedchromosomesin a parent cellat interphase
The same two chromosomes,(duplicated) at interphase, prior to mitosis
Fig. 8-6b, p.129
After mitosisand cytoplasmicdivision, the twodaughter cellseach have one(unduplicated)chromosome.Both daughtercells start lifein interphase.
Fig. 8-7c, p.130
pair of centrioles
The duplicated chromosomes continue to condense. New microtubules move one of two pairs of centrioles to the opposite side of the nucleus. The nuclear envelope starts to break up.
c Late Prophase
Fig. 8-7e, p.130
e MetaphaseAll of the chromosomes havebecome lined up midwaybetween the spindle poles.At this stage of mitosis, thechromosomes are in theirmost tightly condensed form.
Fig. 8-7f, p.130
Sister chromatids separate asmotor proteins moving alongspindle microtubules dragthem to opposite spindlepoles. Other microtubulespush the poles farther apart.
f Anaphase
Fig. 8-7g, p.130
There are two clusters ofchromosomes, which nowdecondense. Patches ofnew membrane fuse to forma new nuclear envelope.Mitosis is over.
g Telophase
Fig. 8-7h, p.130
After cytoplasmic division,there are two daughtercells. Each is diploid: Itsnucleus has two of eachtype of chromosome, justlike the parent cell.
h Two DaughterCells at Interphase
Fig. 8-8a3, p.132
3 The diameter of the contractilering continues to shrink and pull thecell surface inward.