Wake-up

1. Explain the main events of Interphase.

2.Explain the main events of prophase.

Cell Cycle Summary

Purpose of the Cell CycleTo grow, replace old cells, or reproduction

Location of the Cell Cycle

Within an organisms body cells

What is a Body Cell?

All the cells that make up the “body” of an organism.

All organisms have chromosomes (condensed DNA); Also a specific number

Total Number of Chromosomes in a Human Body Cell

How many chromosomes do other organisms have compared

to humans????

How many chromosomes are in a dog?

78

How many chromosomes

are in a mosquito?

6

How many chromosomes are in a Adders Tongue Fern?

1262Most chromosomes

of ALL organisms

Review of the Stages of Cell Cycle

1st Step of the Cell Cycle

Interphase: Cell prepares to divide by

making more organelles and

cytoplasm; Replicates DNA

2nd Step of the Cell CycleMitosis: The replicated DNA is separated

Made up of PMAT

Prophase

DNA coils up into

chromosomes; nucleus

disappears; spindle fibers

appear

Metaphase

Chromosomes line up in the middle of the

cell

Anaphase

Sister chromatids are

pulled to opposite ends

of the cell

Telophase

Opposite of Prophase; DNA

unwinds; spindle fibers

disappear; nucleus

reappears

3rd Step of the Cell Cycle

Cytokinesis: The cell divides the organelles and cytoplasm into the new cell

End Result of the Cell Cycle

Two identical cells with the same number of chromosomes

Interphase MitosisCytokinesis

Summary DiagramDon’t Draw

DNA is in chromatin form

DNA is replicated

during S phase

How many Chromosomes?

3 Chromosomes

DNA is condensed into chromosomes

Metaphase, Anaphase, Telophase

Sister Chromatids are

separated

How many Chromosomes?

3 Chromosomes

How many Chromosomes?

3 Chromosomes in each cell

If an organism has 50

chromosomes and it undergoes

mitosis, how many

chromosomes will be present in

the new cells?

If an organisms diploid number chromosome is 100, how many chromosomes will be

present in the new cells?

If an organism has 18

chromosomes and it undergoes

mitosis, how many

chromosomes will be present in

the new cells?

If an organisms diploid number chromosome is 134,568, how

many chromosomes

will be present in the new cells?

134, 568